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The Collaborative International Dictionary
Corrivate

Corrivate \Cor"ri*vate\ (k?r"r?-v?t), v. t. [L. corrivatus, p. p. of corrivare to corrivate.] To cause to flow together, as water drawn from several streams. [Obs.]
--Burton.

Wiktionary
corrivate

vb. (context obsolete English) To cause to flow together, as water drawn from several streams.