1. An obligatorily anaerobic genus of gram-positive, non-spore-bearing bacteria that appear as cocci and coccobacilli, sometimes in short chains. The type species is Atopobium parvulus, a slow-growing organism forming tiny colonies on standard media. formerly called Peptostreptococcus parvulus and Streptococcus parvulus.
Stedman’s Medical Dictionary © Wolters Kluwer Health. All rights reserved.