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A wind instrument, anciently made of horn, but afterwards of brass (Varr. L. L. v. 117). According to Athenaeus, it was an invention of the Etruscans. Like the tuba, it differed from the tibia in being a larger and more powerful instrument, and from the tuba itself in being curved nearly in the shape of a C, with a crosspiece to steady the instrument for the convenience of the performer. In Greek it is called στρογγύλη σάλπιγξ. It had no stopples or plugs to adjust the scale to any particular mode; the entire series of notes was produced without keys or holes, by the modification of the breath and of the lips at the mouthpiece. Probably, from the description given of it in the poets, it was, like our own horn, an octave lower than the trumpet. The classicum, which originally meant a signal, rather than the musical instrument which gave the signal, was usually sounded with the cornu.

Cornua. (Bartholini.)

Cornu also signifies the end of the sailyards (see Navis), a part of the helmet in which the crest was fixed (see Galea), the end of the stick on which books were rolled (see Liber), a part of a bow, a part of the lyre, and the wing of an army. See Exercitus.

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