Ev`a*nesce" (?), v. i. [imp. & p. p. Evanesced (?); p. pr. & vb. n. Evanescing. ().] [L. evanescere; e out + vanescere to vanish, fr. vanus empty, vain. See Vain, and cf. Evanish.]
To vanish away; to because dissipated and disappear, like vapor.
I believe him to have evanesced or evaporated.
De Quincey.
© Webster 1913.