Source : Webster's Revised Unabridged Dictionary (1913)

Perennibranchiate \Per*en`ni*bran"chi*ate\, a. [See {Perennial},
   and {Branchiate}.]
   1. (Anat.) Having branch[ae], or gills, through life; -- said
      especially of certain Amphibia, like the menobranchus.
      Opposed to caducibranchiate.

   2. (Zo["o]l.) Belonging to the Perennibranchiata.