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binoculars British & World English

An optical instrument with a lens for each eye, used for viewing distant objects

porro-prism binoculars in Porro prism British & World English

A pair of binoculars using two Porro prisms at right angles, resulting in a conventional instrument with objective lenses that are further apart than the eyepieces

roof-prism binoculars in roof prism British & World English

A pair of binoculars using two roof prisms, resulting in an instrument with parallel sides and objective lenses that are the same distance apart as the eyepieces

a pair of binoculars in binoculars British & World English

An optical instrument with a lens for each eye, used for viewing distant objects