Double-stop

Divisi in the orchestra greatly reduces the need for double-stopping, per se, in this form of string playing.

Source: wiktionary

Some Greek musicians have used open tunings on the violin and double-stopped the strings to produce a drone.

Source: wiktionary

The whole movement gives the soloist an opportunity for hair-raising virtuosity, from rapid arpeggios and spectral harmonics to languid parallel sixths, double-stopped trills and, in the trio, a stratospheric cantabile, again on harmonics.

Source: wiktionary

There has been some question concerning whether the downbeat of m. 19 should be a triple-stop with the open D string as the bottom note or a double-stop with the open A string as the bottom note.

Source: wiktionary