ultramarine

US /ˌʌl.trə.məˈriːn/
UK /ˌʌl.trə.məˈriːn/
1.

ultramarino

a bright blue color:

:
The plant has hooded flowers of deepest ultramarine.
1.

ultramarino

of a bright blue color:

:
Often when she went out she wore an ultramarine evening dress.