|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.|
|1.||Ernest Thomas Sinton. 1903--95, Irish physicist. He succeeded in producing the first artificial transmutation of an atomic nucleus (1932) with Sir John Cockcroft, with whom he shared the Nobel prize for physics 1951|
|2.||Izaak (ˈaɪzək). 1593--1683, English writer, best known for The Compleat Angler (1653; enlarged 1676)|
|3.||Sir William (Turner). 1902--83, English composer. His works include Façade (1923), a setting of satirical verses by Edith Sitwell, the Viola Concerto (1929), and the oratorio Belshazzar's Feast (1931)|
|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.