clostridia

This term is the plural form of clostridium. In scientific and medical writing, it refers to the collective group of bacteria within the genus Clostridium. Because it is a Latin-derived plural, it follows a non-standard English pluralization pattern where the singular ends in -um and the plural ends in -a.

Usage is strictly confined to microbiology, pathology, and clinical medicine. It is almost always used in a technical context to describe the presence, growth, or inhibition of these specific anaerobic organisms in a biological or environmental sample.