Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† hĕcătompylos, on (-os, com.; -on, neut.), adj., = ἑκατόμπυλος, of a hundred gates: hecatompylos Thebas nemo non novit, Amm. 22, 16, 2; cf. Hyg. Fab. 275.