Phonetics. the last part of a vowel sound when it differs noticeably in quality from the main sound, as the faint (ē) at the end of the (ā) in the pronunciation of pain.
Origin: 1275–1325; Middle English vanisshen,vanissen < Middle French evaniss-, long stem of e(s)vanir ≪ Latin ex-ex- + vānēscere to pass away, equivalent to vān(us) vain + -ēscere inchoative suffix
c.1300, from aphetic form of stem of O.Fr. esvanir "disappear," from V.L. *exvanire, from L. evanescere "disappear, die out," from ex- "out" + vanescere "vanish," from vanus "empty" (see vain). Vanishing point in perspective drawing is recorded from 1797.