| chemical reaction | |
| —n | |
| Compare nuclear reaction a process that involves changes in the structure and energy content of atoms, molecules, or ions but not their nuclei | |
| 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. |