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early 15c., from Old French masticacion and directly from Latin masticationem (nominative masticatio), noun of action from masticare "to chew" (source of Old French maschier, French mâcher), probably from a Greek source related to mastikhan "to gnash the teeth," from PIE *mendh- "to chew" (see mandible).
masticate mas·ti·cate (mās'tĭ-kāt')
v. mas·ti·cat·ed, mas·ti·cat·ing, mas·ti·cates
To chew food.