Mnemonic tip for Pachyderm:
Pachyderm bole ‘pakki derm’. Paaki derm kiski hogi? Derm bole to skin (dermatologist, skin doctor, yaad karo). Ab pakki skin kiski hoti hai? Haathi, hippo type animals ki. Pachyderm: skin of elephants etc.
Meaning of Pachyderm:
1. Any of various large, thick-skinned, hoofed mammals such as the elephant, rhinoceros, or hippopotamus.