Longman Dictionary of Contemporary English
field glasses
noun
EXAMPLES FROM CORPUS
▪ A silhouette showed behind the net curtains, a silhouette aiming a pair of field glasses.
▪ Elinor leaning over the crazy gate and Otley with his field glasses.
▪ I was led to the verandah, where an ancient pair of field glasses was thrust into my hands.
▪ In return he handed out whips, flagons and field glasses.
▪ Those who stared through telescopes or field glasses saw how drastically the two climbers had slowed on the third day.
Wiktionary
field glasses
n. binoculars.
WordNet
field glasses
n. an optical instrument designed for simultaneous use by both eyes [syn: binocular, binoculars, opera glasses]