An older or variant term meaning able to live or function without oxygen.
From Greek 'an-' (without) + 'aero' (air) + Latin '-ous' (full of, characterized by). This is an archaic or less common variant of 'anaerobic,' reflecting earlier terminology used in microbiology.
Early microbiologists in the 1800s used different word forms to describe oxygen-avoiding bacteria before the terminology standardized to 'anaerobic'—this shows how scientific language evolves as disciplines mature.
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