Answer: proventriculi

AnswerCrossword Clue
proventriculiThe thick-walled muscular expansion of the esophagus above the stomach of crustaceans and insects
proventriculiThe narrow glandular first region of a bird's stomach between the crop and the gizzard
proventriculiPROVENTRICULUS, the first part of a bird's stomach, aka gizzard