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Definition of Acorn cup
1. Noun. Cup-shaped structure of hardened bracts at the base of an acorn. 
Definition of Acorn cup
1. Noun. The involucre or cup in which the acorn is fixed. ¹
¹ Source: wiktionary.com
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1. Noun. Cup-shaped structure of hardened bracts at the base of an acorn. 
1. Noun. The involucre or cup in which the acorn is fixed. ¹
¹ Source: wiktionary.com