Added 10 October 2026 microbial /maɪˈkɹəʊ.bi.əl/ adjective Categories: Describing WordsUncommon Words adjective ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about microbial at Wordnik → Where our words come from → Of, relating to, or caused by microbes or microorganisms. Small; tiny; minuscule. noun A microbe or bacterium. Related Words: microbiologicmicro-organismmicroorganismmicrobiologicalbacterialmicrobiologyantimicrobialanti-microbialbiologicalgermmicro-organismsmicroorganisms Back to today's word