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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

object, physical object go
a tangible and visible entity

whole, unit go
an assemblage of parts that is regarded as a single entity

artifact, artefact go
a man-made object taken as a whole

instrumentation, instrumentality go
an artifact (or system of artifacts) that is instrumental in accomplishing some end

device go
an instrumentality invented for a particular purpose

instrument go
a device that requires skill for proper use

scientific instrument go
an instrument used by scientists

magnifier go
a scientific instrument that magnifies an image

scope, telescope go
a magnifier of images of distant objects

astronomical telescope go
any telescope designed to collect and record electromagnetic radiation from cosmic sources

optical telescope go
an astronomical telescope designed to collect and record light from cosmic sources

reflecting telescope, reflector
optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece

noun.artifact

6 Subcategories

Cassegrainian telescope, Gregorian telescope go
a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror
coude telescope, coude system go
a reflecting telescope so constructed that the light is led to a plate holder or spectrograph
Herschelian telescope, off-axis reflector go
a reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewed
Maksutov telescope go
reflecting telescope in which the aberration of the concave mirror is reduced by a meniscus lens
Newtonian telescope, Newtonian reflector go
reflecting telescope in which the image is viewed through an eyepiece perpendicular to main axis
Schmidt telescope, Schmidt camera go
reflecting telescope that has plate that corrects for aberration so a wide area of sky can be photographed