eu·bac·te·ri·um 
(y
′b
ăk-tîr
ē-
əm)
n. pl. eu·bac·te·ri·a (-tîr
ē-
ə)
See bacterium.
[New Latin eubactērium, back-formed sing. of Eubactēria, former name of the domain Bacteria : Latin eu-, true (the domain Bacteria being considered as comprising the true bacteria, as opposed to the archaea); see EU- + bactēria, pl. of bactērium, bactērium; see BACTERIUM.]