1. A semitranslucent form of opal that becomes translucent or transparent when immersed in water

Derived forms: hydrophanes

• impressibility
• impressible
• impression
• impressionability
• impressionable
• Impressionism
• impressionist
• impressionistic
• impressive
• impressive aphasia
• impressively
• impressiveness
• impressment
• imprest
• imprimatur
• imprimis
• imprint
• imprinting
• imprison
• imprisoned
• imprisonment
• impro
• improbability
• improbable
• improbableness