Fay /(fā)/

Fay

n.
  1. A fairy; an elf.

Fay

n.
  1. Faith; as, by my fay. [Obs.]

Fay

v. t.

imp. & p. p. fayed; p. pr. & vb. n. Faying

  1. To fit; to join; to unite closely, as two pieces of wood, so as to make the surface fit together. (Shipbuilding)

Fay

v. i.
  1. To lie close together; to fit; to fadge; -- often with in, into, with, or together. (Shipbuilding)

Phrases & Compounds
Faying surface
that surface of an object which comes with another object to which it is fastened; -- said of plates, angle irons, etc., that are riveted together in shipwork.