headstream

English Thesaurus

1. a stream that forms the source of a river (noun.object)

hypernym	:	stream, watercourse,
definition	:	a natural body of running water flowing on or under the earth (noun.object)

instance hyponym	:	blue nile,
definition	:	a headstream of the Nile; joins the White Nile at Khartoum to form the Nile (noun.object)

instance hyponym	:	white nile,
definition	:	a headstream of the Nile; joins the Blue Nile at Khartoum to form the Nile (noun.object)