atom (noun)

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• atom — noun ADJECTIVE ▪ charged, unstable ▪ positively charged atoms ▪ carbon, nitrogen, etc. VERB + ATOM ▪ …   Collocations dictionary

• atom — ► NOUN 1) the smallest particle of a chemical element, consisting of a positively charged nucleus surrounded by negatively charged electrons. 2) an extremely small amount: she did not have an atom of strength left. ORIGIN from Greek atomos… …   English terms dictionary

• atom bomb — noun a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239) (Freq. 1) • Syn: ↑atomic bomb, ↑A bomb, ↑fission bomb, ↑plutonium bomb • Hypernyms: ↑nuclear …   Useful english dictionary

• atom bomb — UK / US or atomic bomb UK / US noun [countable] Word forms atom bomb : singular atom bomb plural atom bombs Word forms atomic bomb : singular atomic bomb plural atomic bombs a bomb that causes a very large nuclear explosion from the energy it… …   English dictionary

• atom — noun 1) they build tiny circuits atom by atom Syn: particle, molecule, bit, piece, fragment, fraction 2) there wasn t an atom of truth in the allegations Syn: grain, iota, jot, whit, mite …   Thesaurus of popular words

• atom — late 15c., as a hypothetical indivisible body, the building block of the universe, from L. atomus (especially in Lucretius) indivisible particle, from Gk. atomos uncut, unhewn; indivisible, from a not + tomos a cutting, from temnein to cut (see… …   Etymology dictionary

• atom — noun Etymology: Middle English, from Latin atomus, from Greek atomos, from atomos indivisible, from a + temnein to cut Date: 15th century 1. one of the minute indivisible particles of which according to ancient materialism the universe is… …   New Collegiate Dictionary

• atom bomb — atom ,bomb or a,tomic bomb noun count a bomb that causes a very large nuclear explosion from the energy it produces by SPLITTING atoms (=breaking them apart) …   Usage of the words and phrases in modern English

• atom — noun (C) 1 the smallest part of an element (1) that can exist alone or combine with other substances to form molecules 2 a very small amount of something: There isn t an atom of truth in it …   Longman dictionary of contemporary English

• atom bomb — ► NOUN ▪ a bomb whose explosive power comes from the fission of heavy atomic nuclei …   English terms dictionary

• atom smasher — noun Date: 1937 accelerator d …   New Collegiate Dictionary