'Psalterium' definitions:

Definition of 'psalterium'

(from WordNet)
noun
The third compartment of the stomach of a ruminant [syn: psalterium, omasum, third stomach]

Definition of 'Psalterium'

From: GCIDE
  • Psalterium \Psal*te"ri*um\, n.; pl. Psalteria. [L., a psaltery.] (Anat.) (a) The third stomach of ruminants. See Manyplies. (b) The lyra of the brain. [1913 Webster]