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1620s, from Late Latin inspissatus, past participle of inspissare, from in- + spissare "to thicken," related to spissus "thick" (see spissitude). Related: Inspissated; inspissating.
inspissate in·spis·sate (ĭn-spĭs'āt', ĭn'spĭ-sāt')v. in·spis·sat·ed, in·spis·sat·ing, in·spis·sates To undergo thickening or cause to thicken, as by evaporation or the absorption of fluid.