Definition of diplococcus
: any of various encapsulated bacteria (such as Streptococcus pneumoniae, a common cause of pneumonia) that usually occur in pairs and that were formerly grouped in a single taxon (genus Diplococcus) but are now all assigned to other genera
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Merriam-Webster unabridged
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Time Traveler for diplococcus
The first known use of diplococcus was circa 1881
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