Definition from Wiktionary, the free dictionary
See also bacteria
From Ancient Greek rod (baktēria)
Proper noun 
- In the three-domain system, a taxonomic domain comprising the single kingdom also called Bacteria, containing about 25 phyla.
- In the two-empire system, a taxonomic kingdom, within domain Prokaryota: single cell organisms (the bacteria); once divided into the Archaebacteria and Eubacteria.
Derived terms