Hamburg parsley ham·burg·pars·ley uncommon noun 1. parsley with smooth leaves and enlarged edible taproot resembling a savory parsnip SynonymsHamburg parsleyturnip-rooted parsleyPetroselinum crispum tuberosum Related words Broader terms parsley WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.