Recorded since circa 1380, Middle English philaterie, either from Old French filatiere (12th c), or via Medieval Latin philaterium, an alteration of Late Latin phylacterium, from Ancient Greek φυλακτήριον ("safeguard, amulet"), via adjective φυλακτήριος, from φυλακτήρ, itself from φυλάσσω, from φύλαξ.
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