n. [ Gr. dia`tomos cut in two. See Diatomous. ] 1. (Bot.) One of the Diatomaceæ, a family of minute unicellular Algæ having a siliceous covering of great delicacy, each individual multiplying by spontaneous division. By some authors diatoms are called Bacillariæ, but this word is not in general use. [ 1913 Webster ]
2. A particle or atom endowed with the vital principle. [ 1913 Webster ]
The individual is nothing. He is no more than the diatom, the bit of protoplasm. Mrs. E. Lynn Linton. [ 1913 Webster ]
(Geol.), a deposit of fine, usually white, siliceous material, composed mainly of the shells of the microscopic plants called diatoms; also called infusorial earth, kieselguhr, and diatomite. It is used in polishing powder, and in the manufacture of dynamite. [ 1913 Webster +PJC ]
n. a class of marine and freshwater eukaryotic algae comprising the diatoms. Syn. -- Bacillariophyceae, class Bacillariophyceae, class Diatomophyceae. [ WordNet 1.5 ]
a. [ Gr. dia`tomos cut through, fr. diate`mnein to cut through; dia` through + te`mnein to cut. Cf. Diatom. ] (Min.) Having a single, distinct, diagonal cleavage; -- said of crystals. Mohs. [ 1913 Webster ]
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