monocular UK /mənˈɒk.jə.lə(ɹ)/US /məˈnɑkjələɹ/adjective 3noun 2forms 1 adjective3 •Having one eye....one of his sparks alighted upon my eye and destroyed it making me a monocular ape — 1885 •Of any optical system suitable for use by one eye at a time. •Related to a monocle.You are not such a foolish woman as to like to be seen with Fred Mostyn, that little monocular snob, after the aristocratic, handsome Basil Stanhope. — 1906 noun2 •A monocular telescope, as opposed to binoculars. •(rare) A monocle.The moony monocular set in his eye / Appeared to be scanning the Sweet Bye-and-Bye. — 1911 formsmonoculars