Hypertext Webster Gateway: "Perennibranchiata"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Perennibranchiata \Per*en`ni*bran`chi*a"ta\, n. pl. [NL. See
{Perennial}, and {Branchia}.] (Zo["o]l.)
Those Batrachia which retain their gills through life, as the
menobranchus.
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