heart urchin heart trouble • heart valve · · · Info · Definitions · Characters · · heart urchin · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) sea urchin having a heart-shaped body in a rigid spiny shell. Synonyms: heart urchin. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075