from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The physical theory of the structure, properties, and behavior of the atom.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The theory that all gross matter is composed of atoms.
- n. Any of several theories that explain the structure of the atom, and of subatomic particles.
from the GNU version of the Collaborative International Dictionary of English
- adj. 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.
- n. etc. See under Atomic, Binary, etc.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles
- n. a theory of the structure of the atom
Sorry, no etymologies found.
Five or six years later, atomic theory had been extended to the point where any student could find why the apparently safe product decided to become pure helium and energy in approximately one-billionth of a second.
The first atomic theory was put forward by the Greek philosophers Leucippus and his disciple Democritus, in the fifth century B.C. These men taught that everything is composed of infinitely tiny indivisible particles called atoms.
"Sixty years ago, on the arid southern continent of Wing IV, I was an instructor of atomic theory in a small technological college.
On the other hand, one might also argue -- extending, in a way, the teaching of the physical sciences of the period between the postulation of DALTON'S atomic theory and the discovery of the significance of the ether of space -- that reality is essentially discontinuous, our idea that it is continuous being a mere illusion arising from the coarseness of our senses.