\Van"ish*ing\,
a. & n. from {Vanish}, v.

{Vanishing fraction} (Math.), a fraction which reduces to the
   form 0/0 for a particular value of the variable which
   enters it, usually in consequence of the existence of a
   common factor in both terms of the fraction, which factor
   becomes 0 for this particular value of the variable.
   --Math. Dict.

{Vanishing line} (Persp.), the intersection of the parallel
   of any original plane and picture; one of the lines
   converging to the vanishing point.

{Vanishing point} (Persp.), the point to which all parallel
   lines in the same plane tend in the representation.
   --Gwilt.

{Vanishing stress} (Phon.), stress of voice upon the closing
   portion of a syllable. --Rush.