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trichord

adjective
tri·​chord | \(ˈ)trī¦kȯrd, -ȯ(ə)d\

Definition of trichord 

: of, relating to, or being a piano having three strings tuned in unison to each digital throughout most of its compass

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History and Etymology for trichord

Greek trichordos three-stringed, from tri- three + -chordos stringed, from chordē string

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