(n.pl.) An order of Cephalopoda having four gills. Among living species it includes only the pearly nautilus. Numerous genera and species are found in the fossil state, such as Ammonites, Baculites, Orthoceras, etc.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Tetrabranchiata. Retrieved September 24, 2026, from http://smartdefine.org/tetrabranchiata/definitions/2071535 |
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| MLA | Webster's. "Tetrabranchiata" 28 May 2011. Web. 24 September 2026. <http://smartdefine.org/tetrabranchiata/definitions/2071535> |