LSJ
τά, name of sacred streams at Eleusis, S. Fr. 1089; also ῥειτοί, οἱ, Paus. 1.38.1, Hsch. ; sg. in SIG 86.5 (Eleusis, v BC); ῥῖτοι Hdn. Gr. 2.577, wrongly, as shown by the spelling Ῥετόν SIG l.c.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)