broomrapePronunciation: /ˈbruːmreɪp/Definition of broomrape noun a parasitic plant which bears tubular flowers on a leafless brown stem. It is attached by its tubers to the roots of the host plant. Genus Orobanche, family Orobanchaceae Origin: late 16th century: from broom + Latin rapum 'tuber'broomrape in other Oxford dictionaries Definition of broomrape in the US English dictionary