*SET-U

English word origin

Etymology of lucid

Etymology tree Proto-Indo-European *lewk- Proto-Indo-European *-yeti Proto-Indo-European *-éyeti Proto-Indo-European *lowkéyeti Proto-Italic *loukeō Proto-Indo-European *lewk- Proto-Indo-European *-éh₁ti Proto-Indo-Europ

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

Clear; easily understood. · Mentally rational; sane. · Bright, luminous, translucent, or transparent.

noun

A lucid dream.

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

Etymology tree Proto-Indo-European *lewk- Proto-Indo-European *-yeti Proto-Indo-European *-éyeti Proto-Indo-European *lowkéyeti Proto-Italic *loukeō Proto-Indo-European *lewk- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *lukéh₁yeti Proto-Italic *l(o)ukēō? Latin lūceō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin lūcidus English lucid Latin lucidus, from lūceō (“shine”) + -idus.

Relationships mentioned by the source

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

  • Root classification mention*lewk-ine-pro
  • Unspecified derivation mentionlucidusla
Inspect preserved source fields

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

{
  "templates": [
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":uder",
        "3": "la:lūcidus",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *lewk-\nProto-Indo-European *-yeti\nProto-Indo-European *-éyeti\nProto-Indo-European *lowkéyeti\nProto-Italic *loukeō\nProto-Indo-European *lewk-\nProto-Indo-European *-éh₁ti\nProto-Indo-European *-yeti\nProto-Indo-European *-éh₁yeti\nProto-Indo-European *lukéh₁yeti\nProto-Italic *l(o)ukēō?\nLatin lūceō\nProto-Indo-European *dʰeh₁-der.\nProto-Italic *-iðos\nLatin -idus\nLatin lūcidus\nEnglish lucid\n[Appendix:Glossary#inherited|Inherited]] from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Italic\", \"term\" : \"*loukeō\", \"lang\" : \"itc-pro\" }, { \"alt\" : \"*l(o)ukēō\", \"is_uncertain\" : true, \"lang_name\" : \"Proto-Italic\", \"status\" : \"inline\", \"children\" : [ { \"terms\" : [ { \"alt\" : \"*lukéh₁yeti\", \"lang_name\" : \"Proto-Indo-European\", \"status\" : \"inline\", \"children\" : [ { \"terms\" : [ { \"is_duplicate\" : true, \"children\" : [ ], \"status\" : { \"1\" : \"ine-pro\", \"id\" : \"bright\", \"pos\" : \"root\" }, \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*lewk-\", \"lang\" : \"ine-pro\" }, { \"children\" : [ { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*-éh₁ti\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" }, { \"is_duplicate\" : true, \"children\" : [ ], \"status\" : { \"1\" : \"ine-pro\", \"id\" : \"forming verbs\" }, \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*-yeti\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"From\", \"keyword\" : \"from\" } ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*-éh₁yeti\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang\" : \"itc-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Latin\", \"term\" : \"lūceō\", \"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\" : \"lūcidus\", \"status\" : \"ok\", \"lang\" : \"la\" } ], \"keyword_label\" : \"From\", \"keyword\" : \"uder\" } ], \"lang_name\" : \"English\", \"term\" : \"lucid\", \"status\" : \"ok\", \"lang\" : \"en\" }\" data-lang=\"en\" data-title=\"lucid\">"
    },
    {
      "name": "root",
      "args": {
        "1": "en",
        "2": "ine-pro",
        "3": "*lewk-"
      },
      "expansion": ""
    },
    {
      "name": "uder",
      "args": {
        "1": "en",
        "2": "la",
        "3": "lucidus"
      },
      "expansion": "Latin lucidus"
    },
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":uder",
        "3": "la:lūcidus",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *lewk-\nProto-Indo-European *-yeti\nProto-Indo-European *-éyeti\nProto-Indo-European *lowkéyeti\nProto-Italic *loukeō\nProto-Indo-European *lewk-\nProto-Indo-European *-éh₁ti\nProto-Indo-European *-yeti\nProto-Indo-European *-éh₁yeti\nProto-Indo-European *lukéh₁yeti\nProto-Italic *l(o)ukēō?\nLatin lūceō\nProto-Indo-European *dʰeh₁-der.\nProto-Italic *-iðos\nLatin -idus\nLatin lūcidus\nEnglish lucid"
    }
  ],
  "links": [
    [
      "*lewk-",
      "Reconstruction:Proto-Indo-European/lewk-#Proto-Indo-European:_bright"
    ],
    [
      "*-yeti",
      "Reconstruction:Proto-Indo-European/-yeti#Proto-Indo-European:_forming_verbs"
    ],
    [
      "*-éyeti",
      "Reconstruction:Proto-Indo-European/-éyeti#Proto-Indo-European:_causative_suffix"
    ],
    [
      "*lowkéyeti",
      "Reconstruction:Proto-Indo-European/lowkéyeti#Proto-Indo-European:_shine"
    ],
    [
      "*loukeō",
      "Reconstruction:Proto-Italic/loukeō#Proto-Italic:_shine"
    ],
    [
      "*lewk-",
      "Reconstruction:Proto-Indo-European/lewk-"
    ],
    [
      "*-éh₁ti",
      "Reconstruction:Proto-Indo-European/-éh₁ti"
    ],
    [
      "*-yeti",
      "Reconstruction:Proto-Indo-European/-yeti"
    ],
    [
      "*-éh₁yeti",
      "Reconstruction:Proto-Indo-European/-éh₁yeti"
    ],
    [
      "lūceō",
      "luceo#Latin"
    ],
    [
      "*dʰeh₁-",
      "Reconstruction:Proto-Indo-European/dʰeh₁-#Proto-Indo-European:_do"
    ],
    [
      "*-iðos",
      "Reconstruction:Proto-Italic/-iðos"
    ],
    [
      "-idus",
      "-idus#Latin"
    ],
    [
      "lūcidus",
      "lucidus#Latin"
    ],
    [
      "lucidus",
      "lucidus#Latin"
    ],
    [
      "lūceō",
      "luceo#Latin"
    ],
    [
      "-idus",
      "-idus#Latin"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "adj",
      "glosses": [
        "Clear; easily understood.",
        "Mentally rational; sane.",
        "Bright, luminous, translucent, or transparent."
      ],
      "tags": [],
      "recordId": "1e4c5ca2e93641ba574626b3dfd035b08252e5d7bededa378499214ade3813a2",
      "rawRecordSha256": "97e132595cd5de61b2bb763a47ee299efa134e3ca25331e570d017666e55c949",
      "sourceRecordOrdinal": 272941
    },
    {
      "pos": "noun",
      "glosses": [
        "A lucid dream."
      ],
      "tags": [],
      "recordId": "c9429d06505deabf03dd366f669c806bd64c70e2766aca5800b22b52db4a5053",
      "rawRecordSha256": "f738712f3bfc6996364fb714d5aa8fd38f5159868b6c93a32d5f73df211e56f8",
      "sourceRecordOrdinal": 272942
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 0,
    "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 lucid →

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-bHVjaWQ