noun

• (obsolete, zoology) A member of the obsolete taxonomic order Pachydermata, grouping of thick-skinned, hoofed animals such as the rhinoceros, hippopotamus, elephant and tapir.
• (informal) An elephant
• (idiomatic) A person with thick skin; someone who is not affected by or does not care what others say about him or her.
• (idiomatic) Someone who is insensitive.