tourmaline

play
noun tour·ma·line \ˈtu̇r-mə-lən, -ˌlēn\

Definition of tourmaline

  1. :  a mineral of variable color that consists of a complex borosilicate and is valued as a gem when transparent and cut

Recent Examples of tourmaline from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tourmaline'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of tourmaline

Sinhalese toramalli carnelian

Other Mineralogy Terms


Learn More about tourmaline


Seen and Heard

What made you want to look up tourmaline? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to become worse as time passes

Get Word of the Day daily email!

Test Your Vocabulary

The Emoji Quiz

  • emoji-the-quiz
  • What phase of the moon is this: 🌖 ?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!