[ too r-muh-lin, -leen ]
/ ˈtʊər mə lɪn, -ˌlin /


any of a group of silicate minerals of complex composition, containing boron, aluminum, etc., usually black but having various colored, transparent varieties used as gems.

Nearby words

  1. tourista,
  2. touristic,
  3. touristry,
  4. touristy,
  5. tourmalin,
  6. tournachon, gaspard-félix,
  7. tournai,
  8. tournament,
  9. tournay,
  10. tournedos

Also tour·ma·lin [too r-muh-lin] /ˈtʊər mə lɪn/, turmaline.

Origin of tourmaline

1750–60; earlier tourmalin < German Turmalin, ultimately < Sinhalese tōramalliya carnelian; see -in2

Related formstour·ma·lin·ic [too r-muh-lin-ik] /ˌtʊər məˈlɪn ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for tourmaline

British Dictionary definitions for tourmaline


/ (ˈtʊəməˌliːn) /


any of a group of hard glassy minerals of variable colour consisting of complex borosilicates of aluminium with quantities of lithium, sodium, calcium, potassium, iron, and magnesium in hexagonal crystalline form: used in optical and electrical equipment and in jewellery
Derived Formstourmalinic (ˌtʊəməˈlɪnɪk), adjective

Word Origin for tourmaline

C18: from German Turmalin, from Sinhalese toramalli carnelian

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for tourmaline



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

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for tourmaline


[ turmə-lĭn, -lēn′ ]

Any of several minerals having the general chemical formula (Na,Ca)(Mg,Fe,Al,Li)3Al6(BO3)3Si6O18(OH)4. Tourmaline occurs in many different translucent colors, usually in crystals shaped like 3-, 6-, or 9-sided prisms. It occurs in igneous and metamorphic rocks, especially in pegmatites.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.