Meaning

noun any North American shrubby perennial herb of the genus Heliopsis having large yellow daisylike flowers

noun Eurasian perennial herbs having daisylike flowers with yellow rays and dark centers

noun an oval or round dormer window

originFrom ox + eye. Apparently in some senses, specifically Buphthalmum, translated from Arabic عَيْن الْبَقَر (ʕayn al-baqar, literally “ox-eye”), as also the case for French œil-de-bœuf.

Etymology from Wiktionary, CC BY-SA 3.0