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cusp (n.)

1580s, in astrology, "first entrance of a house in the calculation of a nativity," from Latin cuspis "point, spear, pointed end, head," which is of unknown origin. Astronomical sense is from 1670s, "point or horn of a crescent." Anatomical sense of "a prominence on the crown of a tooth" is from 1839.

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Definitions of cusp from WordNet

cusp (n.)
point formed by two intersecting arcs (as from the intrados of a Gothic arch);
cusp (n.)
a thin triangular flap of a heart valve;
Synonyms: leaflet
cusp (n.)
small elevation on the grinding surface of a tooth;
From wordnet.princeton.edu