/ ˈmæməθ; NAmE / noun , adjective
■ noun
an animal like a large elephant covered with hair, that lived thousands of years ago and is now extinct
■ adjective
[ usually before noun ] extremely large
SYN huge :
a mammoth task
a financial crisis of mammoth proportions
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WORD ORIGIN
early 18th cent.: from Russian mamo(n)t , probably of Siberian origin.