'Guardsman' definitions:

Definition of 'guardsman'

From: WordNet
noun
A soldier who is a member of a unit called `the guard' or `guards'

Definition of 'Guardsman'

From: GCIDE
  • Guardsman \Guards"man\, n.; pl. Guardsmen.
  • 1. One who guards; a guard. [1913 Webster]
  • 2. A member, either officer or private, of any military body called Guards. [1913 Webster]