inspissate

verb2

1. •
   To thicken a fluid, in the sense of making it more viscous, especially by boiling, evaporation, or condensation; to condense.

   • Inspissate at 85°C (moist heat) for 45 min. — 2004
2. •
   Of a fluid: to become more viscous.

   • Instead of allowing the juice after the incision to inspissate on the capsule, he collected it immediately, and dried it by artificial heat. — 1858