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[edit] quoll â(plural quolls) 1  Any of the various carnivorous marsupials of the genus Dasyurus found in Australia and New Guinea, roughly the size of a cat.  1770, Joseph Banks, The Endeavour Journal of Sir Joseph Banks, extended description following entry for 26 August 1770 [1]