1. A venomous serpent; a viper.

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

• otder,
• arter,
• aorder,
• ealder,
• addom,
• sudder,
• undder,
• shadder,
• farder,
• usder,
• urder,
• adiver,
• imder,
• atter,
• anderw,
• addit,
• agter,
• audery,
• adode,
• addess

• Adair,
• ADER,
• adore,
• Addario,
• Adria,
• Addair,
• adhere,
• adar.

The adjective form of the word "adder" is "additive".

The plural of the "adder" can be the "adders".

The singular of the "adder" can be the "adder".