\Welk\, v. i. [imp. & p. p. {Welked}; p. pr. & vb. n.
{Welking}.] [OE. welken; cf. D. & G. welken to wither, G.
welk withered, OHG. welc moist. See {Welkin}, and cf.
{Wilt}.]
To wither; to fade; also, to decay; to decline; to wane.
[Obs.]
      When ruddy Ph?bus 'gins to welk in west. --Spenser.
      The church, that before by insensible degrees welked
      and impaired, now with large steps went down hill
      decaying.                                --Milton.

\Welk\, v. t.
1. To cause to wither; to wilt. [Obs.]
         Mot thy welked neck be to-broke [broken]. --Chaucer.
2. To contract; to shorten. [Obs.]
         Now sad winter welked hath the day.   --Spenser.
3. To soak; also, to beat severely. [Prov. Eng.]

\Welk\, n.
A pustule. See 2d {Whelk}.

\Welk\, n. (Zo["o]l.)
A whelk. [R.]