We don't have any synonyms for usan yet.
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Definition of usan:
(n) :
A historical kingdom of Korea, on Ulleungdo in the Sea of Japan; subjugated by Goryeo in 930 A.D..
(n) :
A hamlet south of Montrose, Angus council area, Scotland (OS grid ref NO7254).
(n) :
Initialism of United States adopted name - unique nonproprietary names assigned to pharmaceuticals marketed in the United States.