Source : Webster's Revised Unabridged Dictionary (1913)

Quay \Quay\, n. [F. quai. See {Key} quay.]
   A mole, bank, or wharf, formed toward the sea, or at the side
   of a harbor, river, or other navigable water, for convenience
   in loading and unloading vessels. [Written also {key}.]

Quay \Quay\, v. t.
   To furnish with quays.

Source : WordNet®

quay
     n : wharf usually built parallel to the shoreline