Doctrine of atoms
Atomic A*tom"ic, Atomical A*tom"ic*al, a. [Cf. F. atomique.] 1. Of or pertaining to atoms. [1913 Webster]

2. Extremely minute; tiny. [1913 Webster]

{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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • The Monroe doctrine — doctrine doc trine (d[o^]k tr[i^]n), n. [F. doctrine, L. doctrina, fr. doctor. See {Doctor}.] 1. Teaching; instruction. [1913 Webster] He taught them many things by parables, and said unto them in his doctrine, Hearken. Mark iv. 2. [1913 Webster] …   The Collaborative International Dictionary of English

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