Definition of mother lode
1
: the principal vein or lode of a region
2
: a principal source or supply
Test Your Vocabulary
Name That Color
-
- Name that color:

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 mother lode
Time Traveler for mother lode
The first known use of mother lode was in 1863
See more words from the same year