Definition of pyloric caecum
1 : one of the tubular pouches opening into the alimentary canal in the pyloric region of most fishes
2 : one of the tubular pouches opening into the ventriculus of an insect
3 : one of the paired tubes in each ray of a starfish that have lateral glandular diverticula, that constitute the liver, and that communicate in pairs by a common duct with the pyloric sac
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