Sail n. : An extent of canvas or other fabric by means of which the wind is made serviceable as a power for propelling vessels through the water.

Sail n. : Anything resembling a sail, or regarded as a sail.

Sail n. : A wing; a van.

Sail n. : The extended surface of the arm of a windmill.

Sail n. : A sailing vessel; a vessel of any kind; a craft.

Sail n. : A passage by a sailing vessel; a journey or excursion upon the water.

Sail n. : To be impelled or driven forward by the action of wind upon sails, as a ship on water; to be impelled on a body of water by the action of steam or other power.

Sail n. : To move through or on the water; to swim, as a fish or a water fowl.

Sail n. : To be conveyed in a vessel on water; to pass by water; as, they sailed from London to Canton.

Sail n. : To set sail; to begin a voyage.

Sail n. : To move smoothly through the air; to glide through the air without apparent exertion, as a bird.

Sail v. t. : To pass or move upon, as in a ship, by means of sails; hence, to move or journey upon (the water) by means of steam or other force.

Sail v. t. : To fly through; to glide or move smoothly through.

Sail v. t. : To direct or manage the motion of, as a vessel; as, to sail one's own ship.

Example:
What single book is recommended for someone wanting to learn to Sail?

Taxonomy
sail, boat, wind, sailboat, sailing, shape, rigging, mainsail, spinnakers, sailmakers, headsails, panels, fore-and-aft sails, cloth, jib, mast, PET film, Genoa.

Defination from the web:
... to generate thrust by being placed in a wind—in essence a vertically-oriented wing. Sails are used in sailing. ... Although fore-and-aft rigs have become more popular on modern yachts, square sails continued to power full rigged ships through the Age of Sail and to the present day. ...