| n. | 1. | (Biol.) A genus of Spirobacteria similar to Spirillum, but distinguished by its motility. One species, the Spirochæte Obermeyeri, is supposed to be the cause of relapsing fever. |
| Noun | 1. | Spirochaeta - type genus of the family Spirochaetaceae; flexible undulating chiefly aquatic bacteria Synonyms: genus Spirochaeta |