Is it ensure, insure, or assure?
late 15c., from Latin macerationem (nominative maceratio), noun of action from past participle stem of macerare (see macerate).
maceration mac·er·a·tion (mās'ə-rā'shən)n.
Softening by soaking in a liquid.
Softening of the tissues after death by autolysis, especially of a stillborn fetus.