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
Translations for 'cull'. British English: cull VERB. If items or ideas are culled from a particular source or number of sources, they are taken and gathered together.All this, needless to say, had been culled second-hand from radio reports. Brazilian Portuguese: separar.