Definitions
Chadwick & Ventris 1973: "pair of cheek-pieces" [for a suit of armor], cf. ταπειαί 'cheeks'
Iliad IV.140:
"[...] παρήιον ἔμμεναι ἵππων [...]"
to make a cheekpiece for horses
References
Chadwick, John and Michael Ventris, 1973 Documents in Mycenaean Greek
Homer, 2003 Iliad (trans. A.T. Murray, ed. William F. Wyatt)