Source : Webster's Revised Unabridged Dictionary (1913)

Wayment \Way"ment\, v. i. [imp. & p. p. {Waymented}; p. pr. &
   vb. n. {Waymenting}.] [OE. waymenten, OF. waimenter,
   gaimenter, guaimenter, from wai, guai, woe! (of Teutonic
   origin; see {Woe}) and L. lamentari to lament. See {Lament}.]
   To lament; to grieve; to wail. [Written also {waiment}.]
   [Obs.]

         Thilke science . . . maketh a man to waymenten.
                                                  --Chaucer.

         For what boots it to weep and wayment, When ill is
         chanced?                                 --Spenser.