Also found in: Thesaurus, Acronyms, Encyclopedia, Wikipedia.
Related to opal: black opal, birthstones
1. A mineral of hydrated silica.
2. A gemstone made of this mineral, noted for its rich iridescence.
[Middle English opalus, from Latin, alteration of Greek opallios, probably from Sanskrit upalaḥ, from variant of upara-, lower, from upa, below; see upo in Indo-European roots.]
o′pal·ine′ (ō′pə-līn′, -lēn′) adj.
(Minerals) 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
[C16: from Latin opalus, from Greek opallios, from Sanskrit upala precious stone]
1. a mineral, an amorphous form of silica, SiO2, with some water of hydration, found in many varieties and colors, including milky white.
2. a gemstone made of this, esp. of an iridescent variety.
[1350–1400; Middle English < Latin opalus < Greek opállios opal, gem]
A usually transparent mineral consisting of hydrous silica. Opal can occur in almost any color, but it is often pinkish white with a milky or pearly appearance. It typically forms within cracks in igneous rocks, in limestones, and in mineral veins. It also occurs in the silica-rich shells of certain marine organisms.
Switch to new thesaurus
|Noun||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
black opal - a dark colored opal with internal reflections of green or red
harlequin opal - a reddish opal with small patches of brilliant color
opaque gem - a gemstone that is opaque
حَجَر عَيْن الشَّمْس: حَجَر كريم
opal[ˈəʊpəl] N → ópalo m
opal[ˈəʊpəl] n → opale f
opal[ˈəʊp/əl] n → opale m or f
a type of usually bluish-white or milky white precious stone, with slight traces or streaks of various other colours. There are three opals in her brooch; (also adjective) an opal necklace. opaal حَجَر عَيْن الشَّمْس: حَجَر كريم опал opala opál(ový) der Opal, Opal-... opal; opal- οπάλιópalo opaal عقیق opaali opaleלשם दूधिया पत्थर opal opál baiduri, opal ópall opale; di opale オパール 단백석, 오팔 opalas opāls opal, baiduri opaalopalopal عقيق opala (de) opal опал opál; opálový opal opal opal โอปอล opal 蛋白石，貓眼石，乳色玻璃 опал دودھيا، ايک پتھر ôpan (khoáng chất) 蛋白石，猫眼石，乳色玻璃