*SET-U

English word origin

Etymology of atom

From Middle English attome, from Middle French athome, from Latin atomus (“smallest particle”), from Ancient Greek ἄτομος (átomos, “indivisible”), from ἀ- (a-, “not”) + τέμνω (témnō, “to cut”, o-grade in τομ-) + -ος (-os

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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 ↗
noun

The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons. · A hypothetical particle posited by Greek philosophers as an ultimate and indivisible component of matter. · The smallest, indivisible constituent part or unit of something. · In logical atomism, a fundamental fact that cannot be further broken down.

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

From Middle English attome, from Middle French athome, from Latin atomus (“smallest particle”), from Ancient Greek ἄτομος (átomos, “indivisible”), from ἀ- (a-, “not”) + τέμνω (témnō, “to cut”, o-grade in τομ-) + -ος (-os). Atoms are so named because they were historically thought up as to be the smallest unit of matter, and thus indivisible. Doublet of atomus.

Relationships mentioned by the source

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

This page abbreviates 8 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.

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    {
      "name": "ety",
      "args": {
        "1": "en",
        "2": ":inh",
        "3": "enm:attome"
      },
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    },
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      "name": "inh",
      "args": {
        "1": "en",
        "2": "enm",
        "3": "attome"
      },
      "expansion": "Middle English attome"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "frm",
        "3": "athome"
      },
      "expansion": "Middle French athome"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "la",
        "3": "atomus",
        "4": "",
        "5": "smallest particle"
      },
      "expansion": "Latin atomus (“smallest particle”)"
    },
    {
      "name": "der",
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ἄτομος",
        "4": "",
        "5": "indivisible"
      },
      "expansion": "Ancient Greek ἄτομος (átomos, “indivisible”)"
    },
    {
      "name": "affix",
      "args": {
        "1": "grc",
        "2": "ἀ-",
        "3": "τέμνω",
        "4": "-ος",
        "t1": "not",
        "t2": "to cut",
        "pos2": "o-grade in τομ-",
        "nocat": "1"
      },
      "expansion": "ἀ- (a-, “not”) + τέμνω (témnō, “to cut”, o-grade in τομ-) + -ος (-os)"
    },
    {
      "name": "dbt",
      "args": {
        "1": "en",
        "2": "atomus"
      },
      "expansion": "Doublet of atomus"
    },
    {
      "name": "ety",
      "args": {
        "1": "en",
        "2": ":inh",
        "3": "enm:attome"
      },
      "expansion": ""
    }
  ],
  "links": [
    [
      "attome",
      "attome#Middle_English"
    ],
    [
      "athome",
      "athome#Middle_French"
    ],
    [
      "atomus",
      "atomus#Latin"
    ],
    [
      "smallest",
      "smallest"
    ],
    [
      "particle",
      "particle"
    ],
    [
      "ἄτομος",
      "ἄτομος#Ancient_Greek"
    ],
    [
      "indivisible",
      "indivisible"
    ],
    [
      "ἀ-",
      "ἀ-#Ancient_Greek"
    ],
    [
      "τέμνω",
      "τέμνω#Ancient_Greek"
    ],
    [
      "-ος",
      "-ος#Ancient_Greek"
    ],
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      "atomus",
      "atomus#English"
    ]
  ],
  "references": [],
  "descendants": [
    {
      "lang": "Swahili",
      "lang_code": "sw",
      "word": "atomi",
      "raw_tags": [
        "borrowed"
      ]
    }
  ],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.",
        "A hypothetical particle posited by Greek philosophers as an ultimate and indivisible component of matter.",
        "The smallest, indivisible constituent part or unit of something.",
        "In logical atomism, a fundamental fact that cannot be further broken down."
      ],
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      "sourceRecordOrdinal": 129060
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  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 8,
    "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 atom →

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-YXRvbQ