restharrow

 
Pronunciation: /ˈrɛstharəʊ/

noun

  • a sticky Old World plant of the pea family, which has pink flowers and creeping woody stems with spines.
    • Genus Ononis, family Leguminosae

Origin:

mid 16th century: from obsolete rest 'stop, arrest' + harrow (because the tough stems impeded the progress of a harrow)