1. A venomous snake, of the viper family, a native of S. Africa, so called because it puffs out the upper part of its body when irritated.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• ouff adder,
• luff adder,
• -uff adder,
• 0uff adder,
• pyff adder,
• phff adder,
• pjff adder,
• piff adder,
• p8ff adder,
• p7ff adder,
• pudf adder,
• pucf adder,
• puvf adder,
• pugf adder,
• putf adder,
• purf adder,
• pufd adder,
• pufc adder,
• pufv adder,
• pufg adder

The plural form of "puff adder" is "puff adders".

The singular form of the word "puff adder" remains the same, "puff adder".