Definify.com
Webster 1913 Edition
Boarder
Board′er
,Noun.
1.
One who has food statedly at another’s table, or meals and lodgings in his house, for pay, or compensation of any kind.
2.
(Naut.)
One who boards a ship; one selected to board an enemy's ship.
Totten.
Webster 1828 Edition
Boarder
BOARDER
,Noun.
1.
One who boards a ship in action; one who is selected to board ships.