A small, dry, one-seeded fruit that does not split open at maturity, with the seed coat separate from the fruit wall. Examples include sunflower seeds and the individual fruits of strawberries.
From Greek 'achainein' meaning 'not to gape or open,' composed of 'a-' (not) and 'chainein' (to gape). This describes the fruit's characteristic of remaining closed when ripe.
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