Definition of lambda
1
: the 11th letter of the Greek alphabet — see Alphabet Table
2
: an uncharged unstable elementary particle that has a mass 2183 times that of an electron and that decays typically into a nucleon and a pion
Test Your Vocabulary
Odd Habits and Quirks
-
- Which of the following best describes an easily irritated person?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share lambda
Time Traveler for lambda
The first known use of lambda was in the 15th century
See more words from the same century