The Collaborative International Dictionary
Inspissating
Inspissate \In*spis"sate\, v. t. [imp. & p. p. Inspissated; p. pr. & vb. n. Inspissating.] [L. inspissatus, p. p. of inspissare to thicken; pref. in- + spissare to thicken, fr. spissus thick.] To thicken or bring to greater consistence, as fluids by evaporation.
Wiktionary
inspissating
vb. (present participle of inspissate English)