Reference for Chullin 143:15

אמר רב הושעיא

excludes the dead foetus whilst yet in the womb of its mother:<span class="x" onmousemove="('comment',' The expression in the open field suggests that the uncleanness is exposed and not concealed or shut up as in the case of the foetus. kkud epus');">¹⁰</span>

Jastrow

Jastrow