ATOKOUS
At"o*kous, a. Etym: [Gr. (Zoöl.)
Defn: Producing only asexual individuals, as the eggs of certain annelids.
ATOLE
A*to"le, n. [Mex. Sp.]
Defn: A porridge or gruel of maize meal and water, milk, or the like.
[Sp. Amer.]
ATOLL
A*toll", n. Etym: [The native name in the Indian Ocean.]
Defn: A coral island or islands, consisting of a belt of coral reef, partly submerged, surrounding a central lagoon or depression; a lagoon island.
ATOM
At"om, n. Etym: [L. atomus, Gr. atome. See Tome.]
1. (Physics) (a) An ultimate indivisible particle of matter. (b) An ultimate particle of matter not necessarily indivisible; a molecule. (c) A constituent particle of matter, or a molecule supposed to be made up of subordinate particles.
Note: These three definitions correspond to different views of the nature of the ultimate particles of matter. In the case of the last two, the particles are more correctly called molecules. Dana.
2. (Chem.)