English Dictionary
apex
n 1: the highest point of something [syn: {vertex}, {peak}, {acme}]
2: the point on the celestial sphere toward which the sun and
solar system appear to be moving relative to the fixed
stars [syn: {solar apex}, {apex of the sun's way}] [ant: {antapex}]
English Computing Dictionary
PEX
(PHIGS Extension to X) Extension to the {X Window System}
providing 3d graphics support.