tefillin

plural of tefilla

(Judaism, countable, in-plural, often) Synonym of phylactery (“either of two small leather cases containing scrolls with passages from the Torah, traditionally worn by a Jewish man (one on the arm (usually the left) and one on the forehead) and now sometimes by a woman at certain morning prayers as a reminder to obey the law as set out in the Bible”).
(Judaism, uncountable) Intercession, prayer; (countable) a prayer.