The hollow on the lower surface of the head from which the proboscis protrudes.
The cavity of the mouth, especially the part of the mouth behind the gums and teeth that is bounded above by the hard and soft palates and below by the tongue and by the mucous membrane connecting it with the inner part of the mandible.
The highest surface on the skull; the crown of the head.
One of the elements of a graph joined or not by edges to other vertices.
A point in 3D space, usually given in terms of its Cartesian coordinates.
The point where the surface of a lens crosses the optical axis.
An interaction point.
The point at which an axis meets a curve or surface.
The common point of the two rays that form an angle.
A sharp downward point opposite a crotch, as in the letters "V" and "W" but not "Y".
The point where the prime vertical meets the ecliptic in the western hemisphere of a natal chart.
A point on the curve with a local minimum or maximum of curvature.
The highest point, top or apex of something.