| 单词 | opal |
| 释义 | opal /oh"peuhl/, n. 1. a mineral, an amorphous form of silica, SiO2 with some water of hydration, found in many varieties and colors, including a form that is milky white. 2. an iridescent variety of this that is used as a gem. 3. a gem of this. [1350-1400; ME < L opalus < Gk opállios opal, gem; prob. from a source akin to Skt upala precious stone] |
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