atom

名词 n.
中文释义
美 [ˈæɾm̩]|[ˈæɾəm]

英文释义

名词 n.
  1. 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.
    — Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: the ability to convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy. The evolutionary precursor of photosynthesis is still under debate, and a new study sheds light. The critical component of the photosynthetic system is the water-oxidizing complex, made up of manganese atoms and a calcium atom.
  2. A hypothetical particle posited by Greek philosophers as an ultimate and indivisible component of matter.
  3. The smallest, indivisible constituent part or unit of something.
    — 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.
  4. In logical atomism, a fundamental fact that cannot be further broken down.
  5. The smallest medieval unit of time, equal to fifteen ninety-fourths of a second. historical
  6. A mote of dust in a sunbeam.
  7. A very small amount; a whit.
    — "Doctor, tell me one word more," said Theodore, quivering with suppressed emotion. "How do you think it will end?" / "I have hardly the faintest atom of hope," answered this honest, earnest man.
  8. An individual number or symbol, as opposed to a list; a scalar value.
  9. An integer representing a particular string.
  10. A non-zero member of a partially ordered set that has only zero below it (assuming that the poset has a least element, its "zero").
    — In a Venn diagram, an atom is depicted as an area circumscribed by lines but not cut by any line.
  11. An element of a set that is not itself a set; an urelement.
  12. An age group division in hockey for nine- to eleven-year-olds. Canada,attributive,usually

词形变化

atoms plural

词汇关系

上位词
composite particle
衍生词
adatom atom bomb atom cocktail atomechanics atomerg atom feed atomic atomical atomically atomism atomist atomistic atomization atomize atom laser atomless atomlike atomology atom physics atompunk atomsite atom smasher atomtronics atomweight Bohr atom Boolean atom catom exotic atom Gabor atom gram atom hadronic atom Hooke's atom interatom metaatom multiatom pseudoatom Rutherford atom Rydberg atom social atom spiroatom subatom superatom vortex atom
相关词
atomgrad ⚛ chemical element Appendix:Subatomic particles
部分词
nucleus atomic nucleus subatomic particle elementary particle proton neutron electron

词源

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.
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