phylactery

Origin

From Late Middle English philacterie, philaterie, filaterie (“amulet; tefilla; balderdash, idle words”), from Late Latin phylacterium (“amulet; reliquary; tefilla”), from Koine Greek φῠλᾰκτήρῐον (phŭlăktḗrĭon, “amulet; tefilla”) (used in the New Testament to translate Hebrew תפילין (“tefillin”)), from Ancient Greek φῠλᾰκτήρῐον (phŭlăktḗrĭon, “fortified outpost, watchman’s post; protection, safeguard”), from φυλακτήρ (phulaktḗr, “guard, watcher”) + -ῐον (-ĭon, suffix forming nouns).