quadruplum nominative neuter singular of quadruplus “quadruplum”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers...
"triple organum". organum triplum (plural organa tripla) a type of organum with three voices, pioneered by medieval composer Pérotin organum quadruplum...
neuter quadruplum); first/second-declension adjective fourfold, quadruple This adjective is rare in Latin. First/second-declension adjective. quadruplum quadruplō...