either of the pair of blackened square cases containing parchments inscribed with biblical passages, bound by leather thongs to the head and left arm, and worn by Jewish men during weekday morning prayers
2.
a reminder or aid to remembering
3. archaic
an amulet or charm
Word origin
C14: from Late Latin phylactērium, from Greek phulaktērion outpost, from phulax a guard
Examples of 'phylacteries' in a sentence
phylacteries
She had married young, a plump, bearded man, a traveller in prayer books and phylacteries.
Adair, Tom (Intro) THREE KINDS OF KISSING - SCOTTISH SHORT STORIES