037-6 Wyo. Code R. § 6-2
. In addition to the terms used in the Wyoming Administrative Procedure Act, W.S. 16-3-101 through 16-3-115, and the definitions given in Chapter II of those regulations, the following definitions apply to contested cases before the Board:
a. "Contestant" means any party who initiates a contest against any petition or proof filed with the Board for its decision, or who seeks to have a water right declared abandoned.
b. "Contestee" means the holder of a water right against which abandonment proceedings have been initiated or a party who has filed a petition or proof with the Board which is being opposed or contested (the term "petitioner" may also be used if no confusion results).
c. "Hearing Officer" means whoever is designated by statute or by the Board as the person to preside over a contested case proceedings.
037-6 Wyo. Code R. § 6-2