Mammoth (noun)

1. A mammoth is an extinct species of elephant-like mammal that lived during the last Ice Age.
2. Something very large, impressive, or difficult to deal with.

Origin:

The word "mammoth" comes from the russian word "mamont" which is the name given to the species of the extinct elephant-like mammal that lived during the last ice age. .

Examples:

1. The bones of a mammoth were found during the construction of the new building.
2. The task of cleaning up the oil spill was a mammoth undertaking.
3. The company's new project is a mammoth undertaking that will take several years to complete.
4. The mammoth tusks of the animal could be worth a fortune.
5. The extinct species of mammoth were much larger than the elephants we know today.