archaebacteria archaean • archaebacterium · · · Info · Definitions · Synonyms · Characters · · archaebacteria · · Text Latin · · Script 14 · · Length 6 · · Syllables Definitions · · · (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae. Synonyms: archaebacterium, archaeobacteria, archeobacteria. · · Noun Definition 1 Synonyms · · · archaebacterium · · Synonym 1 archaeobacteria · · Synonym 2 archeobacteria · · Synonym 3 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 r latin small letter r U+0072 t latin small letter t U+0074