George Herbert Box, 1911 Encyclopædia Britannica (1911)
“ PHYLACTERY (φυλακτήριον) , a Greek word meaning “guard” (sc. against misfortune) , i.e. an amulet. It is applied in the New Testament to the tefillin or “prayer-thongs” worn by orthodox Jews daily at morning-prayer (whether at home or in the synagogue) . The title employed in Hebrew, tefillin, seems really to be derived from an Aramaic term meaning “attachments,” “ornaments”; it corresponds to the Biblical Hebrew word rendered “frontlets” (totafôth) . The tefillin or phylacteries are worn, one on the left arm (the “hand-tefilla”) , and the other on the head (the “head-tefilla”) . ”
