octiphonium (oktifonium)

[NL., = E. octo-. [F., etc., octo-, octo-ba (ok'tō-bās), n. The largest musical instrument of the viol family, invented by J. B. Vuillaume. It had three strings, which, on account of its great size, were stopped by a mechanism of keys and pedals operated by both the fingers and the feet of the player. The tone was powerful and smooth.