noun
A vivid deep blue pigment or color, originally made from lapis lazuli. In Japanese, often used in art, design, and color names. Compare with 群青 (ぐんじょう), which is a similar but slightly different traditional Japanese blue pigment.
See also: 群青
この絵の具セットにはウルトラマリンが入っている。
This paint set contains ultramarine.
She wore an ultramarine dress.