*SET-U

English word origin

Etymology of octa-

Etymology tree Proto-Indo-European *oḱtṓw Proto-Hellenic *oktṓ Ancient Greek ὀκτώ (oktṓ) Ancient Greek ὀκτᾰ- (oktă-) English octa- From Ancient Greek ὀκτα- (okta-, “eight”); compare ὀκτώ (oktṓ).

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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) Ancient Greek ὀκτᾰ- (oktă-) English octa- From Ancient Greek ὀκτα- (okta-, “eight”); compare ὀκτώ (oktṓ).

Relationships mentioned by the source

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

Inspect preserved source fields

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

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        "2": ":uder",
        "3": "grc:ὀκτᾰ-",
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      },
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    },
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      "expansion": "Ancient Greek ὀκτα- (okta-, “eight”)"
    },
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        "2": ":uder",
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    }
  ],
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      "*oḱtṓw",
      "Reconstruction:Proto-Indo-European/oḱtṓw"
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      "*oktṓ",
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    ],
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      "ὀκτώ",
      "ὀκτώ#Ancient_Greek"
    ],
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      "ὀκτᾰ-",
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    ],
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      "ὀκτα-#Ancient_Greek"
    ],
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      "ὀκτώ#Ancient_Greek"
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  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "prefix",
      "glosses": [
        "Eight."
      ],
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  ],
  "omittedAuxiliaryFields": {
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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 octa- →

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-b2N0YS0