One who pitches anything, as hay, quoits, a ball, etc.; specifically (Baseball), the player who delivers the ball to the batsman.

the fielder designated to deliver the pitch to the batter.

(baseball) the person who does the pitching; "our pitcher has a sore arm"

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"; "they have a southpaw on the mound"

The baseball player who is designated to pitch the ball to the batter

The player who throws the ball to the batter.

The fielder designated to pitch the ball to the batter.

The player who delivers the ball to the batter.