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plural proventriculi
(zoology) The part of the avian stomach, between the crop and the gizzard, that secretes digestive enzymes. quotations
In fulmars, the proventriculus is very baggy, and has thick wrinkled walls lined with glands that excrete the waxy oil which courting birds pass to one another in small amounts, perhaps as a way of scent-marking their mate.
2020, Tim Ecott, The Land of Maybe, Short Books, published 2021, page 201
(zoology) A similar part of the digestive system in insects and myriapods.