(n.) One of the catgut strings of a fiddle.

accompany accord air line arpeggio assonate atone attune axis be harmonious be in tune beeline blend broken chord caring catgut chime common chord concento concern concertize concord consonant chord diagonal diameter diminished seventh chord direct line directrix do dominant chord echo edge empathy enharmonic execute fellow feeling fiddlestring great-circle course harmonize horsehair identification interpret involvement major triad make music melodize minor chord musicalize normal nylon string pathos perform perpendicular play play by ear put in tune radius radius vector relating render response responsiveness right line secant segment seventh chord sharing shortcut side sixth chord sound in tune sound together steel string straight straight course straight line straight stretch straightaway streamline string sympathetic chord sympathetic response sympathy symphonize synchronize tangent tone down tone up tonic triad transversal triad tune tune up unbroken chord vector vibes vibrations voice wound string