Verbs

(v)thicken, inspissatemake viscous or dense“thicken the sauce by adding flour”
(v)thicken, inspissatemake thick or thicker“Thicken the sauce”, “inspissate the tar so that it becomes pitch”
(v)thicken, inspissatebecome thick or thicker“The sauce thickened”, “The egg yolk will inspissate”