acorn cup acorn chair • acorn duck · · · Info · Definitions · Characters · · acorn cup · · Text Common · · Latin · · Scripts 9 · · Length Definitions · · · (noun) cup-shaped structure of hardened bracts at the base of an acorn. Synonyms: cupule. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 u latin small letter u U+0075