pitcher (n.1)

"jug with an open spout and generally a handle," originally of metal or earthenware, c. 1200, pichere, from Old French pechier, pichier (12c., altered from bichier), and Medieval Latin picarius, picherius (altered from bicarium), both probably from Greek bikos "earthen vessel" (see beaker). Pitcher-proud (early 15c.) was "drunk." The pitcher-plant (1819) is so called for the shape of the modified leaves, which commonly contain liquid and are adapted to capture and assimilate insects.

pitcher (n.2)

1722, "one who pitches" in any sense, agent noun from pitch (v.1). Originally of one tossing hay into a wagon, etc. In ball games, "player who serves the ball to the batsman," by 1845.

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Definitions of pitcher from WordNet

pitcher (n.)
(baseball) the person who does the pitching;
our pitcher has a sore arm
Synonyms: hurler / twirler
pitcher (n.)
an open vessel with a handle and a spout for pouring;
Synonyms: ewer
pitcher (n.)
the quantity contained in a pitcher;
Synonyms: pitcherful
pitcher (n.)
(botany) a leaf that that is modified in such a way as to resemble a pitcher or ewer;
pitcher (n.)
the position on a baseball team of the player who throws the ball for a batter to try to hit;
he has played every position except pitcher
Synonyms: mound