nounoften field glasses
field glassfield glass
A portable binocular telescope without prisms used especially outdoors for viewing distant objects: used a pair of field glasses to watch the marsh birds.
(plural field glasses)
The term is used for binoculars in both singular and plural, but the plural form field glasses is more common in general use.
- Bini, two at a time, and oculi, eyes) was originally an adjective used to describe things adapted for the simultaneous use of both eyes, as in "binocular vision," "a binocular telescope or microscope"; now "a binocular" is used as a noun, meaning a binocular microscope, a field-glass, &c.