Bailly
ή, όν [ᾰ] hexagonal, P. ALEX.
Apot. 10, p. 24, l. 13 Boer.
Étym. ἑξάγωνος.
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LSJ
ή, όν, hexagonal, Procl. Hyp. 1.16, Simp. in Ph. 419.14; of a hexagon, πλευραί ib. 57.16; ἑ. ἀριθμοί, of a kind of figurate numbers, Iamb. in Nic. p. 60P. ; Astrol., sextile, Paul. Al. R. 3; also of the moon΄s phase, Gal. 9.902.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)