Quartette

Quartette, a musical piece in four parts, or for four voices or instruments.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Quartermaster * Quarto
Quair
Quakers
Quarantine
Quarles, Francis
Quarter Days
Quarter-deck
Quarter-Sessions
Quarter-staff
Quarterly Review
Quartermaster
Quartette
Quarto
Quasimodo Sunday
Quass
Quatre-Bras
Quatrefages de Bréau
Quatremère, Étienne Marc
Quatremère de Quincy
Quatro Cento
Quebec
Quebec