一塁手|いちるいしゅichiruishu

1. noun, baseballfirst baseman
   一塁手いちるいしゅは、走はしってきた打者だしゃにタッチしアウトを取とった。↗

   The first baseman tagged the runner out.

• SynonymファーストNeutralLoanword for first base or the first baseman, and more broadly 'first'. More colloquial than 「一塁手」; common in broadcasts and everyday talk.
• SynonymファーストベースマンNeutralFull loanword name for the first baseman; can also be used to address the player directly. Longer than 「ファースト」, which is the usual everyday short form.

In baseball, the player covering first base is formally written 「一塁手」. In speech 「ファースト」 is the usual choice, common in broadcasts and everyday talk; the full form 「ファーストベースマン」 exists but is used less often.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 野球やきゅうまたはソフトボールにおける守備しゅび位置いちの一ひとつ。打者だしゃから見みて右側みぎがわの内野ないやを守まもる。ファースト。