Bacteroidaceae

noun plural

Bac·​te·​roi·​da·​ce·​ae ˌbak-tə-ˌrȯi-ˈdā-sē-ˌē 

: a family of extremely varied gram-negative bacteria (order Bacteroidales) that usually live in the digestive tract or on mucous surfaces of warm-blooded animals and are sometimes associated with acute infectious processes see bacteroides, fusobacterium