Raphanus raphanistrum rap·ha·nus·raphanistrum uncommon noun 1. Eurasian weed having yellow or mauve or white flowers and podlike fruits Synonymsjointed charlockwild radishwild raperunchRaphanus raphanistrum Related words Broader terms weed Parts Raphanus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.