Definition of opal in English:

opal

Syllabification: o·pal
Pronunciation: /ˈōpəl
 
/

noun

  • A gemstone consisting of hydrated silica, typically semitransparent and showing varying colors against a pale or dark ground.
    More example sentences
    • The traditional kundan work has also been embellished with semi-precious and precious stones and beads such as tourmalines, tanzanites, opals, aquamarine and peridots.
    • Diamonds and opals and onyx sat in lumps in the sparkling coloured windows.
    • In a blinding flash the diamond, moonstone, opal, ruby and sapphire were molded together, inseparable, forever.

Origin

late 16th century: from French opale or Latin opalus, probably based on Sanskrit upala 'precious stone' (having been first brought from India).

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