SINCE 1828

An Encyclopædia Britannica Company

eucairite

noun eu·cai·rite

variants: or less commonly eukairite \yüˈkīˌrīt, -kā-\

Definition of eucairite

plural -s

:a mineral CuAgSe composed of a grayish metallic-looking copper silver selenide (specific gravity 7.50)

There's more!

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

More than 250,000 words that aren't in our free dictionary
Expanded definitions, etymologies, and usage notes
Advanced search features
Ad free!

Origin and Etymology of eucairite

Swedish eukairit, from Greek eukairos seasonable, opportune (from eu- + kairos time, season) + Swedish -it -ite; from its being found soon after the discovery of selenium

Seen and Heard

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

show

WORD OF THE DAY

broadside

play

a strongly worded attack

Words at Play

alt-59c94ad823f29

'Meat Sweats': The Cookout's Worst Nightmare

They're real, but is meat the cause?

alt-59c919f342079

'Diffuse' vs. 'Defuse'

Let us defuse the situation.

alt-59c52d6ee2f72

Breathing Life Into 'Inspire'

The word's origins are quite literal

alt-59c4207ecf106

Let's Talk 'Tea'

Spill it, sip it: just make it hot.

Ask the Editors

video-title-words-of-the-year-1066

Words of the Year: 1066

Or, Why Pig Meat is Called 'Pork' and Cow Meat is Called 'Beef'

How Often Is 'Biweekly'?

Don't get us started on 'bimonthly'

video-irregardless-grammar-peeve-blend-of-the-synonyms-irrespective-and-regardless

Irregardless

It is in fact a real word (but that doesn't mean you should use it).

video-moose-goose-weird-plurals

Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

Word Games

young-plant-shoots

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

You're going to have to memorize the dictionary again.

Take the quiz

stylized-drawing-of-woman-pole-vaulting-across-gap-to-get-trophy

Challenging Vocabulary Quiz Returns!

No tricks, just difficult words.

Take the quiz

Name That Thing

Name That Thing

Test your visual vocabulary with our 10-question challenge!

Take the quiz

SCRABBLE® Sprint

SCRABBLE® Sprint

SCRABBLE® fans, sharpen your skills!

Play the game