opaline noun 3adjective 1forms 3 noun3 •Any of several minerals resembling opal, including a variety of yellow chalcedony. •Synonym of opal glass. •A clear to white liquid secreted by sea hares (genus Aplysia) that becomes viscous upon contact with water.The attack on a sea hare by a spiny lobster causes release of the whitish opaline, followed the co-release of both opaline and ink. adjective1 •Resembling opal in having a milky white iridescence.She was so alive that night, opaline points in her eyes, mouth parted to bare her teeth. — 2023 formsopalines · more opaline · most opaline
