from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several Old World plants of the genus Ononis, having woody stems, axillary pink or purplish flowers, and trifoliate leaves with dentate leaflets.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of various species of small shrubs making up the genus Ononis, especially Ononis repens, which has pink flowers.
Obsolete rest, to check (short for Middle English aresten; see arrest) + harrow1.(American Heritage® Dictionary of the English Language, Fourth Edition)
From rest + harrow. (Wiktionary)