| U-boat | |
| —n | |
| a German submarine, esp in World Wars I and II | |
| [from German U-Boot, abbreviation for Unterseeboot, literally: undersea boat] | |
| a gadget; dingus; thingumbob. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |