In botany and zoology, lacking an arista (a bristle-like appendage, especially on grains and grasses).
From Latin 'ex-' (without) + 'arista' (bristle, awn) + '-ate' (adjective suffix); a precise botanical term distinguishing grass varieties by the presence or absence of awns.
Farmers and botanists cared deeply about whether their wheat or barley had those pointy bristles (aristae) or not—they affected how the grain looked, felt, and behaved, so 'exaristate' became a crucial classification word.
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