noun
Baseball position; the player stationed at first base.
彼は高校野球で一塁手を務めていた。
He played first baseman in high school baseball.
一塁手が難しいゴロをさばいた。
The first baseman handled a difficult grounder.
General term for infielder; 一塁手 is a specific infield position.
Compound of 一 (one), 塁 (base), and 手 (player).