atomic theory 名詞
 原子論,原子學說


 The·o·ry n.; pl. Theories
 1. A doctrine, or scheme of things, which terminates in speculation or contemplation, without a view to practice; hypothesis; speculation.
 Note: ☞ “This word is employed by English writers in a very loose and improper sense. It is with them usually convertible into hypothesis, and hypothesis is commonly used as another term for conjecture. The terms theory and theoretical are properly used in opposition to the terms practice and practical. In this sense, they were exclusively employed by the ancients; and in this sense, they are almost exclusively employed by the Continental philosophers.”
 2. An exposition of the general or abstract principles of any science; as, the theory of music.
 3. The science, as distinguished from the art; as, the theory and practice of medicine.
 4. The philosophical explanation of phenomena, either physical or moral; as, Lavoisier's theory of combustion; Adam Smith's theory of moral sentiments.
 Atomic theory, Binary theory, etc. See under Atomic, Binary, etc.
 Syn: -- Hypothesis, speculation.
 Usage: -- Theory, Hypothesis. A theory is a scheme of the relations subsisting between the parts of a systematic whole; an hypothesis is a tentative conjecture respecting a cause of phenomena.

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 A·tom·ic A·tom·ic·al a.
 1. Of or pertaining to atoms.
 2. Extremely minute; tiny.
 Atomic bomb, see atom bomb in the vocabulary.
 Atomic philosophy, or Doctrine of atoms, a system which, assuming that atoms are endued with gravity and motion, accounted thus for the origin and formation of all things. This philosophy was first broached by Leucippus, was developed by Democritus, and afterward improved by Epicurus, and hence is sometimes denominated the Epicurean philosophy.
 Atomic theory, or the Doctrine of definite proportions Chem., teaches that chemical combinations take place between the supposed ultimate particles or atoms of bodies, in some simple ratio, as of one to one, two to three, or some other, always expressible in whole numbers.
 Atomic weight Chem., the weight of the atom of an element as compared with the weight of the atom of hydrogen, taken as a standard.

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 atomic theory
      n 1: a theory of the structure of the atom
      2: (chemistry) any theory in which all matter is composed of
         tiny discrete finite indivisible indestructible particles;
         "the ancient Greek philosophers Democritus and Epicurus
         held atomic theories of the universe" [syn: atomism, {atomist
         theory, atomistic theory] [ant: holism]