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an organism that lives and grows in the absence of molecular oxygen.(See accompanying table.) adj., adj anaero´bic.
facultative anaerobe a microorganism that can live and grow with or without molecular oxygen.
obligate anaerobe an organism that can grow only in the complete absence of molecular oxygen.
an anaerobe that will grow only in the absence of free oxygen.
ob·li·gate an·aer·obe(ob'li-găt an'er-ōb)
An anaerobe that will grow only in the absence of free oxygen.