LogeionPerseus analysis of ἄμφω:
ἄμφω (both): masc/fem/neut nom/voc/acc dual
LSJ entry
ἄμφω
ἄμφω,
τώ, τά, τώ, also οἱ,
αἱ, τά; gen. ἀμφοῖν S. Ph. 25,
etc., dat. ἀμφοῖν Aj. 1264,
etc.:—A. both, of individuals, Il. 1.363;
of armies or nations, 2.124:—
Hom. uses only nom. and acc.: from Hom. downwards freq. with pl. Noun or Verb, Il. 2.767,
7.255,
etc.; ἐξ ἀμφοῖν, = ἐξ ἀλλήλοιν, S. OC 1425:
sts. indecl.,
h.Cer. 15,
Arist. Top. 118a28,
Theoc. 17.26,
A.R. 1.165.
(For the root cf. ἀμφί.)