Opal
来自Big Physics
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late 16th century: from French opale or Latin opalus, probably based on Sanskrit upala ‘precious stone’ (having been first brought from India).
wiktionary
In Florio’s A World of Words 1598 as opale, from French opale, from Latin opalus, from Byzantine Greek ὀπάλλιος(opállios), from Sanskrit उपल(upala, “gem, stone”), from उपरि(upári, “the upper millstone”). [1].
etymonline
opal (n.)
"mineral like quartz but without crystalline structure," 1590s, from French opalle (16c.) and directly from Late Latin opalus (Pliny), supposedly from Greek opallios, which is possibly ultimately from Sanskrit upala-s "gem, precious stone." Used in Middle English in Latin form (late 14c.). Related: Opaline.
