diatom

diatom is a   Noun

Definition:

[1] 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.

[2] A particle or atom endowed with the vital principle. The individual is nothing. He is no more than the diatom, the bit of protoplasm. Mrs. E. Lynn Linton.

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