Definition of luffer:
(n) :
(sailing, yacht racing) One who luffs (sails close to the wind) in order to threaten a windward opponent.
(n) :
A type of crane or derrick that was historically used in shipbuilding and repair.
(n) :
(architecture) Alternative form of louver. [A type of turret on the roof of certain medieval buildings designed to allow ventilation or the admission of light.]