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opal
(oʊpəl)
Word forms: plural opals
variable noun
An opal is a precious stone. Opals are colourless or white, but other colours are reflected in them.
opal in British English
(ˈəʊpəl)
noun
an amorphous, usually iridescent, mineral that can be of almost any colour, found in igneous rocks and around hot springs. It is used as a gemstone. Composition: hydrated silica. Formula: SiO2.nH2O
Derived forms
opal-like (ˈopal-ˌlike) adjective
Word origin
C16: from Latin opalus, from Greek opallios, from Sanskrit upala precious stoneopal in American English
(ˈoʊpəl)
noun
an amorphous, iridescent mineral, SiO2·n H2O, of various colors, often used as a gem; hydrous silicon oxide
Word origin
L opalus < Gr opallios < Sans úpalaḥ, (precious) stoneImage ofopal
© TinaImages, shutterstock
Examples of 'opal' in a sentenceopal
Word lists withopal
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