Dictionary:

inspissate

  (ĭn-spĭs'āt', ĭn'spĭ-sāt')

To undergo thickening or cause to thicken, as by boiling or evaporation; condense.

[From Late Latin īnspissāre, īnspissāt-, to thicken : Latin in-, causative pref.; see in–² + Latin spissus, thick.]

verb

To make thick or thicker, especially through evaporation or condensation: condense, thicken. See solid/liquid/consistency.

Being thickened, dried, or made less fluid by evaporation.