Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
rest-harrow is a noun meaning "Eurasian plant having loose racemes of pink or purple flowers and spiny stems and tough roots". It carries 2 recorded senses.
Eurasian plant having loose racemes of pink or purple flowers and spiny stems and tough roots
European woody plant having pink flowers and unifoliate leaves and long tough roots; spreads by underground runners
Definitions, synonyms and semantic relations for rest-harrow come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.