noun A line from the center of a regular solid to the center of one of its edges.
noun The distance between the axes (centers of rotation) of two items that interact along a spiral groove, such as intermeshing screws or a vinyl record and needle.
adjective Between axes (any sense).
adjective Pertaining to the perpendicularity (or deviation therefrom) of a set of resolver windings when another set of windings is excited.