Definition of esker
: a long narrow ridge or mound of sand, gravel, and boulders deposited by a stream flowing on, within, or beneath a stagnant glacier
Origin of esker
Irish eiscir ridge
First Known Use: 1848
Learn More about esker
Britannica.com: Encyclopedia article about "esker"
Seen and Heard
What made you want to look up esker? Please tell us where you read or heard it (including the quote, if possible).