| 释义 |
opal
\ˈōpəl\ noun
(-s)
Usage: often attributive
Etymology: Latin opalus, from Sanskrit upala stone, jewel, upper millstone; perhaps akin to Sanskrit upari over — more at over
1. : a mineral SiO2.nH2O that is a hydrated amorphous silica softer and less dense than quartz and typically with definite and often marked iridescent play of colors — see black opal, harlequin opal
2.
a. : opal glass
b. : opaline |