- A triangular protection from the intrados of an arch, or from
an inner curve of tracery. - The beginning or first entrance of any house in the
calculations of nativities, etc. - The point or horn of the crescent moon or other
crescent-shaped luminary. - A multiple point of a curve at which two or more branches of
the curve have a common tangent. - A prominence or point, especially on the crown of a tooth. - A sharp and rigid point.