(Science: bacteria) a genus of motile, aerobic, facultatively anaerobic, coccoid bacteria (family Streptococcaceae) which occur singly or in pairs, with flattened adjacent sides.

They are Gram-indeterminate but have a cell wall like that of gram-positive bacteria, and are parasitic on mammals. The type species is gemella haemolysans, which is found in bronchial secretions and in mucus from the respiratory tract.

Origin: L. Dim. Of geminus, twin

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