Definition of streptococcus
: any of a genus (Streptococcus) of spherical or ovoid chiefly nonmotile and parasitic gram-positive bacteria that divide only in one plane, occur in pairs or chains, and include important pathogens of humans and domestic animals
broadly
: a coccus occurring in chains
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Merriam-Webster unabridged
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Time Traveler for streptococcus
The first known use of streptococcus was in 1877
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