Cirrus cloud, a type of cloud.; In biology, a bundle of cilia fused together into a large mobile projection.; Chrysler Cirrus, a car produced by DaimlerChrysler.; Cirrus (building), a high-rise apartment building in Helsinki, Finland.; Cirrus (rocket), a German rocket.; Cirrus (band), a trance music group.; Cirrus (interbank network), an interbank network (ATM network) by MasterCard.; Cirrus Engine, a British aircraft engine company.; Cirrus Design, an aircraft company based in Duluth, Minnesota.; Code name of a Microsoft internal database product development project — see Microsoft Jet Database Engine#History.; Schempp-Hirth Cirrus, a sailplane.; CIRRUS (Cable Installation, Recovery and Repair Underwater Submersible) — see Submarine communications cable.; Cirrus Logic, a manufacturer of video cards;