noun
corps member; regimental soldier
Refers to a member of a military or paramilitary unit, especially in historical contexts such as the Shinsengumi. Often used for organized corps rather than a generic soldier.
彼は新選組の隊士だった。
He was a member of the Shinsengumi.
隊士たちは毎朝訓練を行った。
The corps members conducted training every morning.