Whilom \Whi"lom\ (hw[imac]"l[u^]m), adv. [AS. hw[imac]lum,
properly, at times, dative pl. of hw[imac]l; akin to G.
weiland formerly, OHG. hw[imac]l[=o]m, See {While}, n.]
Formerly; once; of old; erewhile; at times. [Obs. or Poetic]
--Spenser.
[1913 Webster]
Whilom, as olde stories tellen us,
There was a duke that highte Theseus. --Chaucer.
[1913 Webster]