Having no veins; lacking veins or vein-like structures, often used in botanical or anatomical descriptions.
From Latin prefix 'a-' (without) plus 'venous' (having veins, from Latin 'vena'). This descriptive adjective indicates the absence of venous structures.
Medical language loves the 'a-' prefix for negation—'atypical,' 'asymptomatic,' 'avenous'—and it comes from Greek and Latin, which is why medical terminology often sounds foreign to regular English speakers but makes perfect sense once you know the prefix system.
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