nutmeg tree nut·megt·ree uncommon noun 1. East Indian tree widely cultivated in the tropics for its aromatic seed; source of two spices: nutmeg and mace Synonymsnutmegnutmeg treeMyristica fragrans Related words Broader terms spice tree Parts Myristica Part of nutmeg WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.