The Collaborative International Dictionary of English v.0.48:
Inspissation \In`spis*sa"tion\, n. The act or the process of inspissating, or thickening a fluid substance, as by evaporation; also, the state of being so thickened. [1913 Webster]WordNet (r) 3.0 (2006):
inspissation n 1: the process of thickening by dehydration 2: the act of thickening [syn: thickening, inspissation]