| Noun | 1. | order Spirochaetales - higher bacteria; slender spiral rodlike forms animal order - the order of animals division Eubacteria - one-celled monerans having simple cells with rigid walls and (in motile types) flagella family Spirochaetaceae, Spirochaetaceae - large coarsely spiral bacteria; free-living in fresh or salt water or commensal in bodies of oysters spirochaete, spirochete - parasitic or free-living bacteria; many pathogenic to humans and other animals family Treponemataceae, Treponemataceae - small spirochetes some parasitic or pathogenic |