\Whi"lom\ (hw[imac]"l[u^]m), adv. [AS. hw[=i]lum,
properly, at times, dative pl. of hw[=i]l; akin to G. weiland
formerly, OHG. hw[=i]l[=o]m, See {While}, n.]
Formerly; once; of old; erewhile; at times. [Obs. or Poetic]
--Spenser.
      Whilom, as olde stories tellen us, There was a duke
      that highte Theseus.                     --Chaucer.