absis

Noun

 * 1) apse

Etymology
, from, perfect passive participle of.

Noun

 * 1)  abscissa
 * 2) the first of the two terms by which a point is referred to, in a system of fixed rectilinear coordinate (Cartesian coordinate) axes
 * 3) the horizontal line representing an axis of a Cartesian coordinate system, on which the abscissa (sense above) is shown