κεφαλῆφιν

κεφαλ‐ῆφιν, Ep. gen.and dat. of κεφαλή, Il. 11.350, 10.30, al.; κέφαλ‐φι Od. 20.94.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project