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adding machine
Addis Ababa
Addison
Addison’s disease
addition
additional
additional hedge
additional markon
Additional Member System
additional principal payment
additionality
additionally
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adder (2)

ad·der [ áddər ] (plural ad·ders)


noun 
Definition:
 
small European snake: a small venomous snake that is dark gray with a black zigzag pattern on its back. Native to: Europe.  Latin name Vipera berus.

[ Old English nǣd(d)re "snake" < Germanic. The initial n was lost when "a nadder" was misanalyzed as "an adder"]
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