Expanding
Pronunciation : Ex*pand"ing
Part of Speech : a.
Definition : Defn: That expands, or may be expanded; extending; spreading; enlarging. Expanding bit, Expanding drill (Mech.), a bit or drill made adjustable for holes of various sizes; one which can be expanded in diameter while boring. -- Expanding pulley (Mach.), a pulley so made, as in sections, that its diameter can be increased or diminished.
Source : Webster's Unabridged Dictionary, 1913