Muriel Rukeyser (rōō´kīsər), 1913–80, American poet, b. New York City. Her poetry expresses the beauty and passion in the confrontation between the individual and her constantly changing world. Theory of Flight, her first volume of poems, appeared in 1935. Other works include U.S. 1 (1938), The Green Wave (1948), Body of Waking (1958), Waterlily Fire (1962), Speed of Darkness (1968), and The Collected Poems of Muriel Rukeyser (1978). Her writings also include children's books, essays, and biographies of the scientist Willard Gibbs (1942) and the astronomer Thomas Harlot (1971).