Hard aromatic seed of the nutmeg tree used as spice when grated or ground WordNet 3.0 & Open English WordNet

Nutmeg is the seed, or the ground spice derived from that seed, of several tree species of the genus Myristica; fragrant nutmeg or true nutmeg is a dark-leaved evergreen tree cultivated for two spices derived from its fruit: nutmeg, from its seed, and mace, from the seed covering. Wikipedia

Spice from Myristica fragrans Wikidata

The aromatic seed of this tree, used as a spice. Wiktionary

Seed. Wiktionary (translation)