/ Dictionary / Index T tetrabranchiate: Meaning and Definition of Find definitions for: tet•ra•bran•chi•ate Pronunciation: (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. tetrabrach tetrabromofluorescein Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language