Webster's Revised Unabridged Dictionary · 1913

Opaline

Opaline , adjective

[Compare French opalin.]

Of, pertaining to, or like, opal in appearance; having changeable colors like those of the opal.

Opaline , noun

1.
An opaline variety of yellow chalcedony.
2.
Opal glass.
3.
An opaline color or expanse.