abomasum
- n the fourth compartment of the stomach of a ruminant; the one where digestion takes place
- From the reticulum the food would pass through the third (omasum, bullock tripe) and fourth (abomasum, where milk-curdling rennet is manufactured) stomachs, then on into the intestines.
- The fourth stomach, or abomasum or rennet, corresponds in its histological structure with the stomach of other mammals.