| 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. |
| Walton (wôl'tən) Pronunciation Key
Irish physicist who, with John Cockcroft, was the first to successfully split an atom using a particle accelerator in 1932. For this work they shared the 1951 Nobel Prize for physics. |