Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun opal

1 sense of opal

Sense 1
opal -- (a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones)
       => mineral -- (solid homogeneous inorganic substances occurring in nature having a definite chemical composition)
       => opaque gem -- (a gemstone that is opaque)