From The Collaborative International Dictionary of English v.0.44 [gcide]:
1. (Mus.) A powerful brass instrument of the trumpet kind, thought by some to be the ancient sackbut, consisting of a tube in three parts, bent twice upon itself and ending in a bell. The middle part, bent double, slips into the outer parts, as in a telescope, so that by change of the vibrating length any tone within the compass of the instrument (which may be bass or tenor or alto or even, in rare instances, soprano) is commanded. It is the only member of the family of wind instruments whose scale, both diatonic and chromatic, is complete without the aid of keys or pistons, and which can slide from note to note as smoothly as the human voice or a violin. Softly blown, it has a rich and mellow sound, which becomes harsh and blatant when the tones are forced; used with discretion, its effect is often solemn and majestic.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
102 Moby Thesaurus words for "trombone": English horn, alpenhorn, alphorn, althorn, alto horn, ballad horn, baritone, bass horn, bassoon, block flute, bombard, bourdon, brass choir, brass wind, brass-wind instrument, brasses, bugle, bugle horn, cello, claribel, clarinet, clarion, concert flute, cornet, cornet-a-pistons, corno di caccia, cornopean, cromorna, cymbel, diapason, double-bell euphonium, dulciana, euphonium, flute stop, foundation stop, fourniture, gamba, gedeckt, gemshorn, harmonic flute, helicon, horn, hunting horn, hybrid stop, key trumpet, koppel flute, larigot, lituus, lur, mellophone, melodia, mixture, mutation stop, nazard, oboe, octave, ophicleide, orchestral horn, organ stop, piccolo, plein jeu, pocket trumpet, posaune, post horn, principal, quint, quintaten, rank, ranket, reed stop, register, rohr flute, sackbut, saxhorn, saxtuba, serpent, sesquialtera, shawm, slide trombone, sliphorn, sousaphone, spitz flute, stop, stopped diapason, stopped flute, string diapason, string stop, tenor tuba, tierce, tremolo, tromba, trumpet, tuba, twelfth, unda maris, valve trombone, valve trumpet, vibrato, viola, voix celeste, vox angelica, vox humana
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