The Collaborative International Dictionary of English v.0.48:

adrenergic \adrenergic\ adj.
   1. producing or activated by epinephrine or adrenaline an
      adrenergic nerve fiber
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

adrenergic
    adj 1: relating to epinephrine (its release or action) [syn:
           adrenergic, sympathomimetic]
    n 1: drug that has the effects of epinephrine [syn:
         adrenergic, adrenergic drug]