The Collaborative International Dictionary of English v.0.48:

Tepefy \Tep"e*fy\, v. t. & i. [imp. & p. p. Tepefied; p. pr. &
   vb. n. Tepefying.] [L. tepere to be tepid + -fy; cf. L.
   tepefacere. See Tepid.]
   To make or become tepid, or moderately warm. --Goldsmith.
   [1913 Webster]