1. the third stomach compartment of a ruminant animal, having many folds
Usage: anatomy; veterinary
2. a book of psalms, especially the Book of Psalms
Usage: religious; archaic

Examples

• The veterinarian examined the cow’s psalterium during the autopsy.
• Food passes from the reticulum to the psalterium in ruminant digestion.
• The psalterium contains many leaf-like folds that help process food.
• Medieval monks often copied the psalterium by hand.
• The illuminated psalterium was displayed in the monastery library.
• Scholars studied the ancient psalterium for its historical significance.