*SET-U

English word origin

Etymology of octo-

Etymology tree Proto-Indo-European *oḱtṓw Proto-Hellenic *oktṓ Ancient Greek ὀκτώ (oktṓ)bor. Proto-Indo-European *oḱtṓw Proto-Italic *oktō Latin octōbor. English octo- From Ancient Greek ὀκτώ (oktṓ, “eight”) and Latin oc

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 ↗
prefix

eight

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

Etymology tree Proto-Indo-European *oḱtṓw Proto-Hellenic *oktṓ Ancient Greek ὀκτώ (oktṓ)bor. Proto-Indo-European *oḱtṓw Proto-Italic *oktō Latin octōbor. English octo- From Ancient Greek ὀκτώ (oktṓ, “eight”) and Latin octō (“eight”).

Relationships mentioned by the source

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

  • Unspecified derivation mentionὀκτώgrc
  • Unspecified derivation mentionoctōla
Inspect preserved source fields

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

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    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":bor",
        "3": "grc:ὀκτώ",
        "4": ":bor",
        "5": "la:octō",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *oḱtṓw\nProto-Hellenic *oktṓ\nAncient Greek ὀκτώ (oktṓ)bor.\nProto-Indo-European *oḱtṓw\nProto-Italic *oktō\nLatin octōbor.\nEnglish octo-\n[Appendix:Glossary#loanword|Borrowed]] from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*oḱtṓw\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-Hellenic\", \"term\" : \"*oktṓ\", \"status\" : \"ok\", \"lang\" : \"grk-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Ancient Greek\", \"term\" : \"ὀκτώ\", \"status\" : \"ok\", \"lang\" : \"grc\" } ], \"keyword\" : \"bor\" }, { \"keyword_abbrev\" : \"bor.\", \"keyword_label\" : \"Borrowed from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"id\" : \"eight\", \"children\" : [ { \"terms\" : [ { \"is_duplicate\" : true, \"children\" : [ ], \"id\" : \"eight\", \"status\" : { \"1\" : \"ine-pro\", \"id\" : \"eight\", \"pos\" : \"word\" }, \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*oḱtṓw\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Italic\", \"term\" : \"*oktō\", \"lang\" : \"itc-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Latin\", \"term\" : \"octō\", \"status\" : \"ok\", \"lang\" : \"la\" } ], \"keyword\" : \"bor\" } ], \"lang_name\" : \"English\", \"term\" : \"octo-\", \"status\" : \"ok\", \"lang\" : \"en\" }\" data-lang=\"en\" data-title=\"octo-\">"
    },
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      "args": {
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        "2": "grc",
        "3": "ὀκτώ",
        "4": "",
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      },
      "expansion": "Ancient Greek ὀκτώ (oktṓ, “eight”)"
    },
    {
      "name": "uder",
      "args": {
        "1": "en",
        "2": "la",
        "3": "octō",
        "4": "",
        "5": "eight"
      },
      "expansion": "Latin octō (“eight”)"
    },
    {
      "name": "etymon",
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        "2": ":bor",
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      },
      "expansion": "Etymology tree\nProto-Indo-European *oḱtṓw\nProto-Hellenic *oktṓ\nAncient Greek ὀκτώ (oktṓ)bor.\nProto-Indo-European *oḱtṓw\nProto-Italic *oktō\nLatin octōbor.\nEnglish octo-"
    }
  ],
  "links": [
    [
      "*oḱtṓw",
      "Reconstruction:Proto-Indo-European/oḱtṓw"
    ],
    [
      "*oktṓ",
      "Reconstruction:Proto-Hellenic/oktṓ"
    ],
    [
      "ὀκτώ",
      "ὀκτώ#Ancient_Greek"
    ],
    [
      "*oḱtṓw",
      "Reconstruction:Proto-Indo-European/oḱtṓw#Proto-Indo-European:_eight"
    ],
    [
      "*oktō",
      "Reconstruction:Proto-Italic/oktō#Proto-Italic:_eight"
    ],
    [
      "octō",
      "octo#Latin"
    ],
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      "ὀκτώ",
      "ὀκτώ#Ancient_Greek"
    ],
    [
      "octō",
      "octo#Latin"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "prefix",
      "glosses": [
        "eight"
      ],
      "tags": [
        "morpheme"
      ],
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      "rawRecordSha256": "b9fee40e781a19c652ba077fedea84f102a60f79cb9ca99b6f15fa7c81d2e74d",
      "sourceRecordOrdinal": 183890
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
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}

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 octo- →

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-b2N0by0