Reference for Chullin 100:8

אמר רב יהודה אמר רב

R'Ishmael said: It is th entrance of the rumen.<span class="x" onmousemove="('comment',' Lit., 'the stomach of the rumen'. 'Stomach' was frequently used by ancient doctors to describe the entrance to an organ, viz., 'mouth', 'entrance'.');">⁴</span>

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