Reference for Chullin 100:27
ואיזהו כרס החיצון בשר החופה את רוב הכרס
Geniba said in the name of R'Assi: If a circular hole was cut out [in the rumen having a diameter] of a sela', it is trefah, for then if you were to stretch out [the circumference thereof] it would amount to a handbreadth.
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