Lacking gills or gill structures; without branchia.
From 'a-' (without) + 'branchia' (gills) + '-ous' (adjective suffix meaning full of or characterized by). An alternative form using a different adjective ending.
English has multiple ways to say 'without gills'—abranchial, abranchiate, abranchious—showing how scientific terminology builds flexibility through different Latin and Greek suffixes.
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