One seededfruit

• Single-seeded fruit
• Strawberry, e.g.: Var.
• One-seeded fruit: Var
• One-seeded fruit: Var.

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 .]

Wiktionary Word definitions in Wiktionary
n. (alternative spelling of achene English)