*SET-U

English word origin

Etymology of actin

From Ancient Greek ἀκτίς (aktís, “ray”), based on the shape of the filament formed, + -in.

1 source sectionBrief source recordWiktionary 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 ↗
noun

A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament). · One of the six isoforms of actin.

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

From Ancient Greek ἀκτίς (aktís, “ray”), based on the shape of the filament formed, + -in.

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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  "templates": [
    {
      "name": "wp",
      "args": {},
      "expansion": ""
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ἀκτίς",
        "4": "",
        "5": "ray"
      },
      "expansion": "Ancient Greek ἀκτίς (aktís, “ray”)"
    },
    {
      "name": "suf",
      "args": {
        "1": "en",
        "2": "",
        "3": "in"
      },
      "expansion": "+ -in"
    }
  ],
  "links": [
    [
      "ἀκτίς",
      "ἀκτίς#Ancient_Greek"
    ],
    [
      "-in",
      "-in#English"
    ]
  ],
  "references": [],
  "descendants": [
    {
      "lang": "Spanish",
      "lang_code": "es",
      "word": "actina",
      "raw_tags": [
        "borrowed"
      ]
    }
  ],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament).",
        "One of the six isoforms of actin."
      ],
      "tags": [
        "uncountable",
        "countable"
      ],
      "recordId": "de31d7779ea04820c5b283ae443a6578d65c23f22899f48d74a86e966233555d",
      "rawRecordSha256": "226a366e227e5fddbb8bbed938fade0d07b90ac4f7773edab23187d858e507ff",
      "sourceRecordOrdinal": 802301
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
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    "lexicalRecords": 0,
    "lexicalSenses": 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 actin →

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-YWN0aW4