| Helianthoid | a. (Zool.) Of or pertaining to the Helianthoidea. [ 1913 Webster ] |
| Helianthoidea | ‖n. pl. [ NL., fr. L. helianthes sunflower + -oid. ] (Zool.) An order of Anthozoa; the Actinaria. [ 1913 Webster ] |
| gravelweed | (n) perennial herb with yellow flowers; southern and south central United States, Syn. Verbesina helianthoides |
| white-rayed mule's ears | (n) herb with basal leaves and leafy hairy stems bearing solitary flower heads with white or pale cream-colored rays; northwestern United States, Syn. Wyethia helianthoides |