(1):

(n.) The Book of Psalms; - often applied to a book containing the Psalms separately printed.

(2):

(n.) A rosary, consisting of a hundred and fifty beads, corresponding to the number of the psalms.

(3):

(n.) Specifically, the Book of Psalms as printed in the Book of Common Prayer; among the Roman Catholics, the part of the Breviary which contains the Psalms arranged for each day of the week.