Webster's English Dictionary

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achene

achene \*-'ke-n\ \*-'ke--ne--*l\ n [NL achaenium, fr. a- + Gk chainein to 
   yawn - more at YA]WN : a small dry indehiscent one-seeded fruit developing 
   from a simple ovary and usu. having a thin pericarp attached to the seed 
   at only one point - ache.ni.al aj