Fruit of the buttercup

• Part of a sunflower
• Sunflower seed, botanically
• Hard, dry one-seeded fruit
• Seed of a strawberry or sunflower
• Type of fruit borne by sunflowers
• One-seeded fruit, botanically
• Small dry indehiscent fruit with the seed distinct from the fruit wall

WordNet Word definitions in WordNet
n. small dry indehiscent fruit with the seed distinct from the fruit wall

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Achene \A*chene"\, Achenium \A*che"ni*um\n. [Gr. 'a priv. + ? to gape.] (Bot.) A small, dry, indehiscent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists. [Written also akene and ach[ae]nium .]

Wikipedia Word definitions in Wikipedia
An achene (Greek ἀ, a , privative + χαίνειν, chainein , to gape; also sometimes referred to as akene and occasionally achenium or achenocarp ) is a type of simple dry fruit produced by many species of flowering plants . Achenes are monocarpellate (formed ...