/heb dom"euh der'ee/ , n. , pl. hebdomadaries , adj.
n.
1. Rom. Cath. Ch. a member of a church or monastery appointed for one week to sing the chapter Mass and lead in the recitation of the breviary.
adj.
2. hebdomadal (def. 1).
[ 1400-50; late ME ebdomadarie hebdomadarius. See HEBDOMAD, -ARY ]