Hypertext Webster Gateway: "evanescent"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Evanescent \Ev`a*nes"cent\, a. [L. evanescens, -entis, p. pr. of
evanescere.]
1. Liable to vanish or pass away like vapor; vanishing;
fleeting; as, evanescent joys.
So evanescent are the fashions of the world in these
particulars. --Hawthorne.
2. Vanishing from notice; imperceptible.
The difference between right and wrong, is some
petty cases, is almost evanescent. --Wollaston.
From WordNet (r) 1.7 (wn)
evanescent
adj : tending to vanish like vapor; "evanescent beauty"
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