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"earthen jug," c.1200, from Old French pichier (12c.), altered from bichier, from Medieval Latin bicarium, probably from Greek bikos "earthen vessel" (see beaker). Pitcher-plant is recorded from 1819; so called for its resemblance.
"one who pitches," 1722, agent noun from pitch (v.1). Originally of one tossing hay into a wagon, etc.; baseball sense first recorded 1845.
a vessel for containing liquids. In the East pitchers were usually carried on the head or shoulders (Gen. 24:15-20; Judg. 7:16, 19; Mark 14:13).