Definition of "whilest"

whilest¹

conjunction
1. Obsolete form of whilst.

whilest²

verb
1. (archaic) second-person singular simple present indicative of while
  Quotations
  I imagine nothing;I see how ’t is thou whilest the time awayWhen I am gone!
  1843, Henry Wadsworth Longfellow, The Spanish Student, II, iv