This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The highest point; the apex or summit: the vertex of a mountain.

n. Anatomy The highest point of the skull.

n. Anatomy The top of the head.

n. Astronomy The highest point reached in the apparent motion of a celestial body.

n. Mathematics The point at which the sides of an angle intersect.

n. Mathematics The point on a triangle or pyramid opposite to and farthest away from its base.

n. Mathematics A point on a polyhedron common to three or more sides.

n. The highest point of something.

n. The highest surface on the skull.

n. The common point of the two rays of the angle, or its equivalent structure in polyedra (meeting of edges) and higher order polytopes.

n. A point on the curve with a local minimum or maximum of curvature.

n. One of the elements of a graph joined or not by edges to other vertices.

n. A point in 3D space, usually given in terms of its Cartesian coordinates.

n. The point where the surface of a lens crosses the optical axis.

n. An interaction point.

n. The point where the prime vertical meets the ecliptic in the western hemisphere of a natal chart.

n. A turning point; the principal or highest point; top; summit; crown; apex.

n. The top, or crown, of the head.

n. The zenith, or the point of the heavens directly overhead.

n. The point in any figure opposite to, and farthest from, the base; the terminating point of some particular line or lines in a figure or a curve; the top, or the point opposite the base.

n. In geometry, the point at which concurrent straights meet.

n. The highest or principal point; apex; top; crown; summit.

n. In mathematics, a point of a figure most distant from the center; any convex angle of a polygon.

n. the point of intersection of lines or the point opposite the base of a figure

n. the highest point (of something)

"Thus: what we call the vertex of the Brain is really its base and what we call its base is really its vertex, it is simply a question of nomenclature."

vertex of a surface of revolution   

intersection    point of intersection    intersection point   

sheaf    principal vertex of a conic section    vertex of an angle    vertex of a curve    vertex of an angloid    vertex presentation    vertex of a cone    Mathworld    com    vertices   

vertices   

top    summit    crown    apex    to   

apex    zenith    y-intercept