Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rĕ-flŭo, ĕre, v. n., to flow or run back; to flow off, overflow (poet. and in post-Aug. prose): Maeandros ambiguo lapsu refluitque fluitque, Ov. M. 8, 163: refluit amnis, Verg. A. 8, 240; cf. unda, id. ib. 8, 87; id. G. 4, 262: Nilus campis, id. A. 9, 32.
Of the tide, Plin. 2, 97, 99, § 213.