Quintuplex

"This was entered 1 ♅. iii., in November, 1776, and had the honour of being the object to which the grand forty-foot reflector was first directed, in February, 1787, under the designation of “quadruple.” As a trapezium it was gazed at, measured, and delineated, for upwards of fifty years, when Σ. announced it “quintuplex,” by the addition of the little star E."

"Indeed, physiologically considered, the liver is the great original duplex, while anatomically, it is the enigmatical quintuplex; for it has five lobes, five vessels, five ligaments, five fissures, and, singularlly^([sic]) enough, five letters spells its name."

"Clemson Homes has 32 duplexes with two- and three-bedroom units, four quadruplexes and four quintuplexes, providing a total of 100 apartments."