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English word:    

cusp

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cusp in WordNet English dictionary

noun
  1. point formed by two intersecting arcs (as from the intrados of a Gothic arch)
    cusp 
  2. small elevation on the grinding surface of a tooth
    cusp 
  3. a thin triangular flap of a heart valve
    cusp  leaflet 
WordNet Lexical Database v3.0, © 2006 Princeton University