Fugacious /(?)/

Fu·ga·cious

Fugacious

a.
  1. Flying, or disposed to fly; fleeing away; lasting but a short time; volatile.
    Much of its possessions is so hid, so fugacious, and of so uncertain purchase.
  2. Fleeting; lasting but a short time; -- applied particularly to organs or parts which are short-lived as compared with the life of the individual. (Biol.)