Definition of opal
: 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
From the M-W Editors
Origin and Etymology of opal
Latin opalus, from Greek opallios, ultimately from Sanskrit upala stone, jewel
First Known Use: circa 1586
OPAL Defined for English Language Learners
opal
playDefinition of opal for English Language Learners
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: a white or clear stone that reflects changing colors and that is used in jewelry
OPAL Defined for Kids
opal
playDefinition of opal for Students
: a mineral with soft changeable colors that is used as a gem
Learn More about opal
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See words that rhyme with opal Spanish Central: Translation of opal Nglish: Translation of opal for Spanish speakers Britannica.com: Encyclopedia article about opal
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