Dictionary![]() ![]() tet•ra•coc•cusPronunciation: (te"tru-kok'us), [key] —n., —pl. -coc•ciPronunciation: (-kok'sī, -sē), [key] Bacteriol. a spherical bacterium occurring in square groups of four. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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