The Collaborative International Dictionary of English v.0.48:

autocoid \autocoid\ n.
   1. any physiologically active internal secretion, especially
      one of uncertain classification.

   Syn: autacoid.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

autocoid
    n 1: any physiologically active internal secretion especially
         one of uncertain classification [syn: autacoid,
         autocoid]