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The Collaborative International Dictionary of English v.0.48 (gcide)

Cusp \Cusp\ (k[u^]sp), n. [L. cuspis, -idis, point, pointed
end.]
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1. (Arch.) A triangular protection from the intrados of an
arch, or from an inner curve of tracery.
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2. (Astrol.) The beginning or first entrance of any house in
the calculations of nativities, etc.
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3. (Astron) The point or horn of the crescent moon or other
crescent-shaped luminary.
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4. (Math.) A multiple point of a curve at which two or more
branches of the curve have a common tangent.
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5. (Anat.) A prominence or point, especially on the crown of
a tooth.
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6. (Bot.) A sharp and rigid point.
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Cusp \Cusp\, v. t. [imp. & p. p. {Cusped} (k[u^]spt); p. pr. &
vb. n. {Cusping}.]
To furnish with a cusp or cusps.
[1913 Webster] cuspate