Etymology
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tourmaline (n.)

complete silicate of aluminum and boron, 1759, from French or German, ultimately from Sinhalese toramalli, a general name for cornelian.

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Definitions of tourmaline

tourmaline (n.)
a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones;
From wordnet.princeton.edu