Term: cassegrainian telescope: a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: pennant: a long flag; often tapering
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: drag: something that slows or delays progress
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: cable television: television that is transmitted over cable directly to the receiver
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: battering ram: a ram used to break down doors of fortified buildings
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: saucepan: a deep pan with a handle; used for stewing or boiling
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: spanish grunt: a kind of grunt
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: judaica: historical and literary materials relating to Judaism
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: television equipment: electronic equipment that broadcasts or receives electromagnetic waves representing images and sound
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: pott's disease: TB of the spine with destruction of vertebrae resulting in curvature of the spine
Broader: instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end | Unrelated: pilot balloon: meteorological balloon used to observe air currents