1) Become thick or thicker 2) Change integrity 3) Condense 4) Make or become dense 5) Make thick or thicker 6) Make viscous or dense 7) Thicken 8) To become viscous Found on https://www.crosswordclues.com/clue/inspissate
In·spis'sate transitive verb [ imperfect & past participle Inspissated ; present participle & verbal noun Inspissating .] [ Latin inspissatus , past participle of inspissare to thicken; prefix in- + spissare... Found on http://www.encyclo.co.uk/webster/I/70