proventriculus

1. The division of the stomach in birds that secretes digestive enzymes and passes food from the crop to the gizzard.
2. A similar digestive chamber in certain insects and worms.

[PRO–² + Latin ventriculus, stomach, diminutive of venter, belly.]

1. the elongated, spindle-shaped, glandular stomach of birds. Supplemented by the muscular stomach just distal to it.
2. the ruminant forestomachs.