nuclear.
Pertaining to the nucleus of an atom.
Meaning & usage
Pertaining to the nucleus of an atom.
Involving energy released by nuclear reactions (fission, fusion, radioactive decay).
a nuclear reactor
nuclear technology
Relating to a weapon that derives its force from rapid release of energy through nuclear reactions.
a nuclear explosion
a nuclear power
Having nuclear weapons.
Involving an extreme course of action, or one with severe consequences.
nuclear option, nuclear solution
Pertaining to the nucleus of a cell.
Pertaining to a centre around which something is developed or organised; central, pivotal.
Nuclear Polynesian languages include Hawaiian and Samoan.
Relating to, being of, or comprising the nuclear family.
Where this word comes from
From Latin nū̆cleus, a contraction of the adjective nuculeus, masculine of feminine nuculea (“pertaining to a small nut”) from nucula + adjectival suffix -eus, -ea, -eum. The Latin nucula + -āris adds up to nuculāris, a term that in English becomes nucular; the Latin nuculea + -āris, becomes Latin nuculeāris (“relative to what pertains to small nut”), later contracted into nuclear. By surface analysis, nucleus + -ar. Compare muscle and Latin mūsculus; muscular and mūsculāris.
Nuclear power.
Nuclear weapon
Where this word comes from
From Latin nū̆cleus, a contraction of the adjective nuculeus, masculine of feminine nuculea (“pertaining to a small nut”) from nucula + adjectival suffix -eus, -ea, -eum. The Latin nucula + -āris adds up to nuculāris, a term that in English becomes nucular; the Latin nuculea + -āris, becomes Latin nuculeāris (“relative to what pertains to small nut”), later contracted into nuclear. By surface analysis, nucleus + -ar. Compare muscle and Latin mūsculus; muscular and mūsculāris.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.