Pachyderm (noun)

A mammal of a group that includes elephants, rhinoceroses, and hippopotamuses, characterized by thick skin and, in the case of elephants and rhinoceroses, large size.

Origin:

Early 19th century, from greek pakhudermos "thick-skinned", from pakhus "thick" + derma "skin".

Examples:

1. Elephants are the largest pachyderms.
2. The rhinoceros is a pachyderm known for its thick skin and large horn.
3. Hippopotamuses are pachyderms that can weigh up to 1,500 kg.
4. Pachyderms are known for their thick skin which protects them from predators.
5. The pachyderm exhibit at the zoo was closed for repairs.