When a geometry is described by a set of axioms, the notion of a line is usually left undefined (a so-called primitive object). The properties of lines are then determined by the axioms which refer to them.
Definition of mull 1: friable forest humus that forms a layer of mixed organic matter and mineral soil and merges gradually into the mineral soil beneath 2: a finely powdered solid especially in a suspension
â¢ SPALL (noun). The noun SPALL has 1 sense: 1. a fragment broken off from the edge or face of stone or ore and having at least one thin edge. Familiarity information: SPALL used as a noun is very rare.