Learner's Dictionary
mobile search
Home
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
My Saved Words
Login
×
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Most Popular
My Saved Words
Log in
Learner's Dictionary
catalyst
1 ENTRIES FOUND:
catalyst
(noun)
Save
catalyst
/
ˈ
kætələst/
noun
plural
catalysts
catalyst
/
ˈ
kætələst/
noun
plural
catalysts
Learner's definition of CATALYST
[
count
]
1
technical
:
a substance that causes a chemical reaction to happen more quickly
2
:
a person or event that quickly causes change or action
The bombing attack was the
catalyst
for war.
She was proud to be a
catalyst
for reform in the government.
[+] more examples
[-] hide examples
[+] Example sentences
[-] Hide examples
Comments & Questions
Comments & Questions
What made you want to look up
catalyst
? Include any comments and questions you have about this word.
Please enable JavaScript to view the
comments powered by Disqus.
ASK THE EDITOR
What is the difference between
there
,
their
, and
they're
?
See the answer »
LEARNER'S QUIZZES
Vocabulary Quiz
Test your word power
Take the Quiz »
Name That Thing
Take our visual quiz
Test Your Knowledge »
LEARNER'S WORD OF THE DAY
bay
:
a large area of water that is part of an ocean or lake and partly surrounded by land
Learn More »