Definition of Sumatra
island of western Indonesia south of the Malay Peninsula area 182,542 square miles (472,784 square kilometers) ◆The Equator divides Sumatra into two almost equal parts.
Sumatranplay \-trən\ adjective or noun
SUMATRA Defined for English Language Learners
Definition of Sumatra for English Language Learners
: island of Indonesia
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Britannica.com: Encyclopedia article about Sumatra
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