Source : Webster's Revised Unabridged Dictionary (1913)

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.

Inspissate \In*spis"sate\, a. [L. inspissatus, p. p.]
   Thick or thickened; inspissated. --Greenhill.

Source : WordNet®

inspissate
     v 1: make viscous or dense; "thicken the sauce by adding flour"
          [syn: {thicken}]
     2: make thick or thicker; "Thicken the sauce"; "inspissate the
        tar so that it becomes pitch" [syn: {thicken}] [ant: {thin}]
     3: become thick or thicker; "The sauce thickened"; "The egg
        yolk will inspissate" [syn: {thicken}] [ant: {thin}]