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
Noun. 1. moll-the girlfriend of a gangster. gangster's moll, gun moll. criminal, crook, felon, malefactor, outlaw-someone who has committed a crime or has been legally convicted of a crime.