| tetrabranchiate | |
| —adj | |
| 1. | of, relating to, or belonging to the Tetrabranchiata, a former order of cephalopod molluscs having four gills and including the pearly nautilus |
| —n | |
| 2. | any mollusc belonging to the Tetrabranchiata |
| a gadget; dingus; thingumbob. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |