Windward is the direction upwind (toward where the wind is coming from) from the point of reference.
Leeward is the direction downwind (or downward) from the point of reference. The side of a ship that is towards the leeward is its
lee side. If the vessel is heeling under the pressure of the wind, this will be the "lower side". During the age of sail, the term
weather was used as a synonym for
windward in some contexts, as in the
weather gage.