Reference meaning
tourmaline
Last updated
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
Source and scope
This definition is reproduced from Princeton WordNet 3.0, sense 15076619-n, under the WordNet 3.0 License. It has not yet received VocabularyBase editorial review. Read the source and license details.