Welk, n. A pustule.  See 2d Whelk.
  Welk, n. Zool. A whelk.  [R.]
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  Welk v. i. [imp. & p. p. Welked p. pr. & vb. n. Welking.]  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.]