| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| 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. |
ribonuclease ri·bo·nu·cle·ase (rī'bō-n&oomacr;'klē-ās', -āz', -ny&oomacr;'-)
n.
Any of various enzymes that catalyze the hydrolysis of RNA. Also called RNase.