noun, noun which may take the genitive case particle 'no'
cinnamon (color); cinnamon brown
A warm reddish-brown color, like the spice cinnamon. Used as a noun or with の to modify another noun.
彼女は肉桂色のセーターを着ていた。
She was wearing a cinnamon-colored sweater.
壁を肉桂色に塗った。
I painted the wall cinnamon brown.
シナモン is the spice itself or a flavor; 肉桂色 is strictly the color.
Compound of 肉桂 (にっけい, 'cinnamon') + 色 (いろ, 'color'). The reading にっけい is the standard Japanese reading for the spice name.