*SET-U

English word origin

Etymology of fluid

Etymology tree Proto-Indo-European *bʰel-der. Proto-Indo-European *bʰlewH-der. Proto-Indo-European *bʰluH-yé-ti? Latin fluō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin fluidusder. Middle English

1 source sectionExtended source reportWiktionary original ↗
In this entry · 1 source sections

The source etymologies

Wiktionary via Kaikki / Wiktextract

The source reports below are imported and unreviewed by *SET-U. Separate numbered origins and differing source variants are preserved; agreement within this extraction is not independent corroboration.

Unnumbered source etymology

Original entry ↗
adj

Of or relating to fluid. · In a state of flux; subject to change. · Moving smoothly, or giving the impression of a liquid in motion. · Convertible into cash.

noun

Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma. · A liquid (as opposed to a solid or gas). · Intravenous fluids.

Selected source glosses provide context, not a complete modern definition inventory

Etymology tree Proto-Indo-European *bʰel-der. Proto-Indo-European *bʰlewH-der. Proto-Indo-European *bʰluH-yé-ti? Latin fluō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin fluidusder. Middle English fluid English fluid From Middle English fluid, from Latin fluidus (“flowing; fluid”), from Latin fluō (“to flow”), from Proto-Indo-European *bʰleh₁- (“to swell; surge; overflow; run”). Akin to Ancient Greek φλύειν (phlúein, “to swell; overflow”). Not related to English flow, which is a native, inherited word from *plew-, but is distantly related from English bleat.

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

  • Root classification mention*bʰel- (blow)ine-pro
  • Inherited-form mentionfluidenm
  • Derivation mentionfluidusla · flowing; fluid
  • Derivation mentionfluōla · to flow
  • Derivation mention*bʰleh₁-ine-pro · to swell; surge; overflow; run
  • Cognate mentionφλύεινgrc · to swell; overflow
  • Cognate mentionbleaten

This page abbreviates 1 auxiliary source items. The etymology narrative is not shortened. Omission counts are available in the audit fields below; consult the original for complete auxiliary material.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

{
  "templates": [
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":inh",
        "3": "enm:fluid<ety:der<la:fluidus>>",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *bʰel-der.\nProto-Indo-European *bʰlewH-der.\nProto-Indo-European *bʰluH-yé-ti?\nLatin fluō\nProto-Indo-European *dʰeh₁-der.\nProto-Italic *-iðos\nLatin -idus\nLatin fluidusder.\nMiddle English fluid\nEnglish fluid\n[Appendix:Glossary#derived_terms|Derived]] from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"is_uncertain\" : true, \"children\" : [ { \"keyword_abbrev\" : \"der.\", \"keyword_label\" : \"Derived from\", \"terms\" : [ { \"id\" : \"overflow\", \"children\" : [ { \"keyword_abbrev\" : \"der.\", \"keyword_label\" : \"Derived from\", \"terms\" : [ { \"id\" : \"blow\", \"children\" : [ ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*bʰel-\", \"lang\" : \"ine-pro\" } ], \"keyword\" : \"derived\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*bʰlewH-\", \"lang\" : \"ine-pro\" } ], \"keyword\" : \"derived\" } ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*bʰluH-yé-ti\", \"status\" : \"inline\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Latin\", \"term\" : \"fluō\", \"status\" : \"ok\", \"lang\" : \"la\" }, { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"keyword_abbrev\" : \"der.\", \"keyword_label\" : \"Derived from\", \"terms\" : [ { \"id\" : \"do\", \"children\" : [ ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*dʰeh₁-\", \"lang\" : \"ine-pro\" } ], \"keyword\" : \"derived\" } ], \"lang_name\" : \"Proto-Italic\", \"term\" : \"*-iðos\", \"status\" : \"inline\", \"lang\" : \"itc-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Latin\", \"term\" : \"-idus\", \"status\" : \"ok\", \"lang\" : \"la\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang_name\" : \"Latin\", \"term\" : \"fluidus\", \"status\" : \"ok\", \"lang\" : \"la\" } ], \"keyword\" : \"derived\" } ], \"lang_name\" : \"Middle English\", \"term\" : \"fluid\", \"status\" : \"inline\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"English\", \"term\" : \"fluid\", \"status\" : \"ok\", \"lang\" : \"en\" }\" data-lang=\"en\" data-title=\"fluid\">"
    },
    {
      "name": "root",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*bʰel- (blow)"
      },
      "expansion": ""
    },
    {
      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "fluid"
      },
      "expansion": "Middle English fluid"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "fluidus",
        "t": "flowing; fluid"
      },
      "expansion": "Latin fluidus (“flowing; fluid”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "fluō",
        "t": "to flow"
      },
      "expansion": "Latin fluō (“to flow”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*bʰleh₁-",
        "t": "to swell; surge; overflow; run"
      },
      "expansion": "Proto-Indo-European *bʰleh₁- (“to swell; surge; overflow; run”)"
    },
    {
      "name": "cog",
      "args": {
        "1": "grc",
        "2": "φλύειν",
        "t": "to swell; overflow"
      },
      "expansion": "Ancient Greek φλύειν (phlúein, “to swell; overflow”)"
    },
    {
      "name": "noncog",
      "args": {
        "1": "en",
        "2": "flow"
      },
      "expansion": "English flow"
    },
    {
      "name": "cog",
      "args": {
        "1": "en",
        "2": "bleat"
      },
      "expansion": "English bleat"
    },
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":inh",
        "3": "enm:fluid<ety:der<la:fluidus>>",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *bʰel-der.\nProto-Indo-European *bʰlewH-der.\nProto-Indo-European *bʰluH-yé-ti?\nLatin fluō\nProto-Indo-European *dʰeh₁-der.\nProto-Italic *-iðos\nLatin -idus\nLatin fluidusder.\nMiddle English fluid\nEnglish fluid"
    }
  ],
  "links": [
    [
      "*bʰel-",
      "Reconstruction:Proto-Indo-European/bʰel-#Proto-Indo-European:_blow"
    ],
    [
      "*bʰlewH-",
      "Reconstruction:Proto-Indo-European/bʰlewH-#Proto-Indo-European:_overflow"
    ],
    [
      "*bʰluH-yé-ti",
      "Reconstruction:Proto-Indo-European/bʰluH-yé-ti"
    ],
    [
      "fluō",
      "fluo#Latin"
    ],
    [
      "*dʰeh₁-",
      "Reconstruction:Proto-Indo-European/dʰeh₁-#Proto-Indo-European:_do"
    ],
    [
      "*-iðos",
      "Reconstruction:Proto-Italic/-iðos"
    ],
    [
      "-idus",
      "-idus#Latin"
    ],
    [
      "fluidus",
      "fluidus#Latin"
    ],
    [
      "fluid",
      "fluid#Middle_English"
    ],
    [
      "fluid",
      "fluid#Middle_English"
    ],
    [
      "fluidus",
      "fluidus#Latin"
    ],
    [
      "fluō",
      "fluo#Latin"
    ],
    [
      "*bʰleh₁-",
      "Reconstruction:Proto-Indo-European/bʰleh₁-"
    ],
    [
      "φλύειν",
      "φλύειν#Ancient_Greek"
    ],
    [
      "flow",
      "flow#English"
    ],
    [
      "*plew-",
      "Reconstruction:Proto-Indo-European/plew-"
    ],
    [
      "bleat",
      "bleat#English"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "adj",
      "glosses": [
        "Of or relating to fluid.",
        "In a state of flux; subject to change.",
        "Moving smoothly, or giving the impression of a liquid in motion.",
        "Convertible into cash."
      ],
      "tags": [
        "not-comparable"
      ],
      "recordId": "35a271e9157185668541272d070220199a5845cf4de4652c26a37d7050af4af0",
      "rawRecordSha256": "c21a10b1ca12b6895d2c503e729386e76b459949f9cdf3b3156a0a30afdfa06c",
      "sourceRecordOrdinal": 38446
    },
    {
      "pos": "noun",
      "glosses": [
        "Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.",
        "A liquid (as opposed to a solid or gas).",
        "Intravenous fluids."
      ],
      "tags": [
        "countable",
        "uncountable",
        "colloquial",
        "specifically"
      ],
      "recordId": "699ae34656001789c7d481f64b4381fd77dfec950549324d13c841ebde1b210e",
      "rawRecordSha256": "048517ef411a3d78b9e0c82e711903d0cebd8fc7923be76610975f36f722d150",
      "sourceRecordOrdinal": 38445
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 1,
    "glosses": 0
  }
}

Where this record stops

This page does not supply an independently verified sound-change sequence, first-use manuscript or complete family tree unless a cited analysis explicitly establishes one. Missing detail here is a limit of this record—not a claim that humanity knows nothing more.

An older meaning does not determine what a word must mean today. Follow the sources, preserve disagreements, and keep ancestry separate from interpretation.

Contribute located evidence for fluid →

Source and snapshot

Imported from Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Selected fields are reformatted and grouped; wording, source identity and etymology sections are retained. CC-BY-SA-4.0 applies to the imported source material.

Dump: 2026-10-01 · Extracted: 2026-10-30. These are snapshot dates, not the word’s first attestation or the page’s revision date.

Source entry and bibliography ↗Wiktionary revision history ↗Acquisition and rights ledger
Machine-source provenance
Source SHA-256
5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
Import run
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID
w-Zmx1aWQ