Dictionary  tet•ra•bran•chi•atePronunciation: (te"tru-brang'kē-it, -āt"), [key] —adj. belonging or pertaining to the Nautiloidea (Tetrabranchiata), a subclass or order of cephalopods with four gills, including the pearly nautilus and numerous fossil forms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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