Webster
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Webster’s Revised Unabridged Dictionary · 1913

Clef

Clef (klĕf; 277), n. [F. clef key, a key in music, fr. L. clavis key. See Clavicle.] (Mus.) A character used in musical notation to determine the position and pitch of the scale as represented on the staff.

☞ The clefs are three in number, called the C, F, and G clefs, and are probably corruptions or modifications of these letters. They indicate that the letters of absolute pitch belonging to the lines upon which they are placed, are respectively C, F, and G. The F or bass clef, and the G or treble clef, are fixed in their positions upon the staff. The C clef may have three positions. It may be placed upon the first or lower line of the staff, in which case it is called soprano clef, upon the third line, in which case it called alto clef, or upon the fourth line, in which case tenor clef. It rarely or never is placed upon the second line, except in ancient music. See other forms of C clef under C, 2.

Alto clef, Bass clef. See under Alto, Bass.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.