Home Dee Dee Word of the Day – Sept. 19 – Inspissate Dee Dee Word of the Day – Sept. 19 – Inspissate By Staff mB - September 19, 2012 1302 Verb: Inspissate ( in-SPISS-ayt) Definition: To make or become thick or thicker. The recipe said the stew would begin to inspissate after it simmered for about an hour.