| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| a gadget; dingus; thingumbob. |
| water jacket | |
| —n | |
| Compare air jacket a water-filled envelope or container surrounding a machine, engine, or part for cooling purposes, esp the casing around the cylinder block of a pump or internal-combustion engine | |