The opalines are a small group of peculiar protists, found as endosymbionts in the gut of frogs and toads. Each cell has two or more nuclei (hundreds in some species), and is covered in short flagella, arranged in rows. As such, they somewhat resemble ciliates, but opalines have only one sort of nucleus, lack mouths, and divide longitudinally (between flagellar rows).

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

An opaline color or expanse.

having a play of lustrous rainbow-like colors; "an iridescent oil slick"; "nacreous (or pearlescent) clouds looking like mother-of-pearl"; "a milky opalescent (or opaline) luster"

Opaline is the third album by Dishwalla. It was released on 23 April 2002 on Immergent Records.

Opal glass.

An opaque glass, which is created by adding opaquing agents to a glassy material.

a dense translucent glass that derives its diffused nature from the addition of bone ash, and is colored using metallic oxides, usually in pastel hues.

An opaline variety of yellow chalcedony.

Containing opal.