The Collaborative International Dictionary of English v.0.48:

AEsthetic \[AE]s*thet"ic\, AEsthetical \[AE]s*thet"ic*al\, a.
   Of or Pertaining to [ae]sthetics; versed in [ae]sthetics; as,
   [ae]sthetic studies, emotions, ideas, persons, etc.
   [1913 Webster] -- [AE]s*thet"ic*al*ly, adv.
   [1913 Webster]