Nutmeg is the spice made by grinding the seed of the fragrant nutmeg (Myristica fragrans) tree into powder. ... Dried nutmegs are grayish brown ovals with furrowed surfaces. The nutmegs are roughly egg-shaped, about 20.5 - 30 mm (0.81 1.18 in) long and 15 - 18 mm (0.59 - 0.71 in) wide, weighing 5 - 10 g (0.18 - 0.35 oz) dried