- the player whose position is first base.
Origin of first baseman
An Americanism dating back to 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for first baseman
Plucky captain and first-baseman of the Harvard nine looks for a victory over the Tigers.The Arrival of Jimpson
Ralph Henry Barbour
First-baseman started back for it, and the pitcher ran to cover first.
Billings hit a short grounder to first-baseman who scooped it up and tagged the bag before the batsman was half-way toward it.