- any of several composite plants, especially of the genera Heliopsis and Buphthalum, having ray flowers surrounding a conspicuous disk.
- any of several shorebirds, as the least sandpiper.
- oeil-de-boeuf.
- any Eurasian plant of the genus Buphthalmum, having daisy-like flower heads with yellow rays and dark centres: family Asteraceae (composites)
- any of various North American plants of the related genus Heliopsis, having daisy-like flowers
- oxeye daisy another name for daisy (def. 2)
