"to shield from punishment, to conceal," late 15c., from screen (n.). Meaning "examine systematically for suitability" is from 1943; sense of "to release a movie" is from 1915. Related: Screened; screening.
"A fast-growing hybrid conifer which is narrowly conical with a dense growth of shoots bearing scale-like leaves, widely grown as a screening plant or for shelter", 1930s: named after Christopher J. Leyland (1849–1926), British horticulturist.