cusp cusk • cuspal · · · Info · Definitions · Synonyms · Characters · · cusp · · Text Latin · · Script 4 · · Length Definitions · · · (noun) point formed by two intersecting arcs (as from the intrados of a Gothic arch). · · Noun Definition 1 (noun) a thin triangular flap of a heart valve. Synonyms: leaflet. · · Noun Definition 2 (noun) small elevation on the grinding surface of a tooth. · · Noun Definition 3 Synonyms · · · leaflet · · Synonym 1 Characters · · c latin small letter c U+0063 p latin small letter p U+0070 s latin small letter s U+0073 u latin small letter u U+0075