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cusp
 
Noun cusp has 3 senses
  1. cusp - point formed by two intersecting arcs (as from the intrados of a Gothic arch)
    --1 is a kind of     point
  2. cusp, leaflet - a thin triangular flap of a heart valve
    --2 is a kind of flap
    --2 is a part of heart valve, cardiac valve
  3. cusp - small elevation on the grinding surface of a tooth
    --3 is a kind of     point, tip, peak
    --3 is a part of tooth
cushy cusin cusiness cusions cusip cusk-eel cusk cuson cusp cuspate cuspated cusped cuspid cuspidal cuspidate cuspidated cuspidation

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