n. United States operatic soprano (born in 1929)
n. structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
n. (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock
n. 窗台（板）( sill的复数形式 ); 门槛; 侵入火成岩席; 平巷底