Bacteriaceae

noun plural

Bac·​te·​ri·​a·​ce·​ae (ˌ)bak-ˌtir-ē-ˈā-sē-ˌē 

1

in some classifications : a large family of rod-shaped usually gram-negative bacteria (order Bacillales) that produce no spores and have a complex metabolism utilizing amino acids and generally carbohydrates

2

in former classifications : a family comprising all simple cylindrical bacteria lacking a sheath and including the family Bacteriaceae, the genus Bacillus, and a number of other groups