Whi"lom (?), adv. [AS. hwilum, properly, at times, dative pl. of hwil; akin to G. weiland formerly, OHG. hwilm, See While, n.]
Formerly; once; of old; erewhile; at times.
[Obs. or Poetic]
Whilom, as olde stories tellen us,
There was a duke that highte Theseus.
© Webster 1913.