Without air or pneumatic properties; not containing or relating to air-filled spaces or pneumatic systems.
From Greek 'a-' (without) + 'pneuma' (air, breath, spirit). A rare medical/scientific term describing the absence of air-filled structures.
In biology, apneumatic organisms lack air sacs or air-filled structures that other animals use for buoyancy or respiration—an adaptation that makes them denser and better adapted to certain environments.
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