opal

play
noun \ˈō-pəl\

Definition of opal

  1. :  a usually amorphous mineral that is a hydrated silica softer and less dense than quartz and typically with definite and often marked iridescent play of colors and is used especially as a gem

Recent Examples of opal from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'opal.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of opal

Latin opalus, from Greek opallios, ultimately from Sanskrit upala stone, jewel


OPAL Defined for English Language Learners

opal

play
noun

Definition of opal for English Language Learners

  • : a white or clear stone that reflects changing colors and that is used in jewelry


OPAL Defined for Kids

opal

play
noun \ˈō-pəl\

Definition of opal for Students

  1. :  a mineral with soft changeable colors that is used as a gem



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