terzetto

from WordNet (r) 3.0 (2006)

terzetto
    n 1: the cardinal number that is the sum of one and one and one
         [syn: {three}, {3}, {III}, {trio}, {threesome}, {tierce},
         {leash}, {troika}, {triad}, {trine}, {trinity}, {ternary},
         {ternion}, {triplet}, {tercet}, {terzetto}, {trey}, {deuce-
         ace}]

from The Collaborative International Dictionary of English v.0.48

Terzetto \Ter*zet"to\, n. [It., dim. of terzo the third, L.
   tertius. See {Tierce}.] (Mus.)
   A composition in three voice parts; a vocal (rarely an
   instrumental) trio.
   [1913 Webster] Tesla coil

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