• WordNet 3.6
    • n dibranchiate cephalopods having two gills
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Webster's Revised Unabridged Dictionary
    • a Dibranchiate (Zoöl) Having two gills.
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Century Dictionary and Cyclopedia
    • dibranchiate Having two gills; specifically, in cephalopods, pertaining to the Dibranchiata.
    • n dibranchiate A cephalopod of the order Dibranchiata; a dibranch.
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In literature:

An extinct genus of Dibranchiate Cephalopods.
"The Ancient Life History of the Earth" by Henry Alleyne Nicholson
The structure of the Dibranchiate's eye is shown in section in fig.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6" by Various