cusp

(n) point formed by two intersecting arcs (as from the intrados of a Gothic arch)
(n) a thin triangular flap of a heart valve leaflet,
(n) small elevation on the grinding surface of a tooth

leaflet

cusk cuss

cub cud cue cul cum cup cur cut

Cuba cube cuff cuke cull culm cult cunt Cuon curb curd cure curl curt cusk cuss cute

cuspate cuspated cusped cuspid cuspidal cuspidate cuspidated cuspidation cuspidor