atomic

Something that has to do with atoms is atomic. Atomic structure, for example, means the way an atom is organized and what it's made of.

You'll often find the word atomic specifically describing power or weapons — in this case, atomic means the process of either splitting an atom, known as fission, or joining two atoms, fusion, to create energy. Also, every chemical element has its own atomic number, which is the number of protons in the nucleus of one of the element's atoms. Atomic comes from the Latin atomus, "indivisible particle," from the Greek atomos, "uncut" or "indivisible."

Definitions of atomic
  1. adjective
    of or relating to or comprising atoms
    atomic structure”
    atomic hydrogen”
  2. adjective
    immeasurably small
    Synonyms:
    little, small
    limited or below average in number or quantity or magnitude or extent
  3. adjective
    (weapons) deriving destructive energy from the release of atomic energy
    atomic bombs”
    synonyms: nuclear
    thermonuclear
    using nuclear weapons based on fusion as distinguished from fission
    see moresee less
    Antonyms:
    conventional
    (weapons) using energy for propulsion or destruction that is not nuclear energy
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