inspissate

intr. & tr.v., -sat·ed, -sat·ing, -sates.
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.]

inspissation in'spis·sa'tion n.
inspissator in·spis'sa'tor n.

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.

to condense, thicken