Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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F clef the bass clef.
F layer the highest zone of the ionosphere, between 120 and 250 miles above the earth.
f-number the relative aperture of a camera lens, representing the light it will transmit, which is obtained by dividing the focal length of the lens by the diameter of the aperture.
f-stop for a camera lens, an aperture setting corresponding to an f-number. [2 definitions]
John F. Kennedy the 35th President of the United States (1961-1963), who pursued a foreign policy of anti-Communism, established the Peace Corps, and worked for civil rights in the United States. He was assassinated in Dallas, Texas on November 22, 1963 (b.1917--d.1963).