Glaucium flavum glau·ciumf·la·vum uncommon noun 1. yellow-flowered Eurasian glaucous herb naturalized in along sandy shores in eastern North America Synonymshorn poppyhorned poppyyellow horned poppysea poppyGlaucium flavum Related words Broader terms flower Parts Glaucium WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.