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atom

(chemistry, physics) 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.

ˈætəmCurrent111 viewsLast reviewed Jun 29, 2026+ Add a definition
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10 citations · last seen May 2026

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#1·Apr 27, 2026

(chemistry, physics) 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.

Origin: From , from , from , from , from . Atoms are so named because they were historically thought up as to be the smallest unit of matter, and thus indivisible.. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
Heard in the wild
  • “lmao now im at club atom and its soooo white dudes omg”

    — Bluesky· May 2026
  • “Atom Shop Update, 5th May #Fallout76 #Fallout”

    — Bluesky· May 2026
  • “[some-subscribed-rss] New Post: llm-echo 0.5a0, by Simon Willison https://simonwillison.net/2026/May/5/llm-echo/#atom-everything”

    — Bluesky· May 2026
  • “the natural endpoint of being a needy girl overdose fan is to hate the ceo of wss playground with every atom in your body”

    — Bluesky· May 2026
  • “[some-subscribed-rss] New Post: datasette-llm 0.1a7, by Simon Willison https://simonwillison.net/2026/May/5/datasette-llm/#atom-everything”

    — Bluesky· May 2026
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#2·Apr 27, 2026

(now generally regarded, _, figuratively) The smallest, indivisible constituent part or unit of something.

But at this critical moment the pirate astern sent a mischievous shot and knocked one of the men to atoms at the helm.
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#3·Apr 27, 2026

(history of science) A hypothetical particle posited by Greek philosophers as an ultimate and indivisible component of matter.

Towards the following morning, the thermometer fell to 5°; and at daylight, there was not an atom of water to be seen in any direction.
Heard in the wild
  • “Ton PC Windows est lent ? 🐌 J'ai trouvé LE cleaner ultime : Atom Tool Box ! Nettoyage rapide, boost de perfs, c'est une dinguerie. 🚀 Découvre comment l'utiliser dans ma nouvelle vidéo YouTube juste ici 👇 https://youtu.be/WqKyyyu3qNQ #Tech #Windows #AtomToolBox #AstucePC”

    — Bluesky· May 2026
  • “Sing to me, sing to me Fat Old Sun - Atom Heart Mother”

    — Bluesky· May 2026
  • “Sur Radio Progrès : 🎵 Balduin; Atom Smith; Kate Thomas – Hep Cat Boogie (Atom Smith Remix) 🎧 1 auditeur en direct #NowPlaying #RadioProgrès”

    — Bluesky· May 2026
  • “Joshua M. Courtney: Permutation Routing on Ramanujan Hypergraphs with Applications to Neutral Atom Quantum Architectures https://arxiv.org/abs/2605.02498 https://arxiv.org/pdf/2605.02498 https://arxiv.org/html/2605.02498”

    — Bluesky· May 2026
  • “Kenneth M. Merz, et al.: Crossing the 12,000-atom barrier with heterogeneous quantum-classical supercomputing: quantum chemistry of protein-ligand complexes https://arxiv.org/abs/2605.01138 https://arxiv.org/pdf/2605.01138 https://arxiv.org/html/2605.01138”

    — Bluesky· May 2026
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