Κηφῑσός · Kēphisos — LSJ
in Phocis, running into Lake Copais, Il. 2.522, Pi. P. 4.46:—fem. λίμνη Κηφισίς, Il. 5.709, h.Ap. 280:—Dor. Κᾱφ-, of the nymph Copais, Pi. P. 12.27:—Adj. Κηφίσιος, α, ον, Dor. Κᾱφ-, Id. O. 14.1.
at Athens, S. OC 687 (lyr.), etc.
in Argolis, etc., Str. 9.3.16, etc.: —freq. written Κηφισσός in codd., but -σ- in derivs. in Att. Inscrr.