noun
a small, dry, one-seeded fruit that does not split open to release its seed, typical of many plants in the buttercup family
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The achene is a type of dry fruit that contains a single seed.
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I found a bunch of achenes scattered around the garden.
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Those little achenes are so annoying to clean up!
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The idea took root in her mind like an achene, slowly growing into a full-fledged plan.