Definition of diabase
2
chiefly British
: an altered basalt
3
: a fine-grained rock of the composition of gabbro but with an ophitic texture
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Who Knew?
-
- What is a ruelle?

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
Spell words. Make bears.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Share diabase
Time Traveler for diabase
The first known use of diabase was in 1811
See more words from the same year