A small sac or berry-like cavity in a plant, especially a small stone in certain fruits or a juice-secreting sac in a gland.
From Latin acinus, ultimately from Greek akis, meaning a sharp point or needle, then extended to mean berry or grape seed as these were pointed.
Grapes themselves are named from structures described by this word—acini are those tiny juice-filled bubbles you see when you cut a grape, each a perfect little bottle designed by nature.
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