Definition of niais:
(n) :
(obsolete) A young hawk; an eyas.
(n) :
An island of Indonesia, located on the western coast of Sumatra.
(n) :
A regency in North Sumatra, the capital is Gido.
(n) :
The ethnolinguistic group from this island.
(n) :
The Austronesian language spoken by this group.
(n) :
Initialism of nonintentionally added substances.