STROKE n.
One of a series of beats or movements against a resisting medium, by means of which movement through or upon it is accomplished; as, the stroke of a bird's wing in flying, or an oar in rowing, of a skater, swimmer, etc.; also: (Rowing)
WORK n.
The causing of motion against a resisting force. The amount of work is proportioned to, and is measured by, the product of the force into the amount of motion along the direction of the force. See Conservation of energy, under Conservation, Unit of work, under Unit, also Foot pound, Horse power, Poundal, and Erg. Energ…