[1] The unglossed headword itself is neuter.
[2] The distinction between the Attic second declension -gews and the Late -geios is dialectal and not gender-based. See LSJ s.v. katw/gaios at web address 1.
[3] From alpha 2582. See also kappa 1106.
*katw/geios first appears in Herodian the grammarian (not as a hypothetical form: De prosodia catholica vol. 3.1, p. 191), and Porphyry (De antro nympharum 8.16); it is the form that has survived into Modern Greek (katw/gi, katw/i). *)anw/geios does not appear before Eustathius (Commentary on the Iliad vol.2 p.301); it has likewise survived into Modern Greek (a)nw/gi, a)nw/i).