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
Definitions for stell. Here are all the possible meanings and translations of the word stell. Webster Dictionary(2.50 / 2 votes)Rate this definition: Stell(verb) to place or fix firmly or permanently. Stell(verb) a prop; a support, as for the feet in standing or cilmbing.