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proventriculus

Pronunciation: /ˌprəʊvɛnˈtrɪkjʊləs/

Definition of proventriculus

noun (plural proventriculi)

Zoology

the narrow glandular first region of a bird’s stomach between the crop and the gizzard.
the thick-walled muscular expansion of the oesophagus above the stomach of crustaceans and insects.