Bekhorot 47: words to know

כְּקָטָן שֶׁנּוֹלַד דָּמֵי (kekatan shenolad damei): Is considered like a newborn child. Reish Lakish cites this rule to explain why a convert's prior children do not prevent subsequent firstborn status.
וְאָזְדוּ לְטַעְמַיְיהוּ (ve'azdu leta'amayhu): And they follow their own reasoning. The Gemara shows how Rabbi Yoḥanan and Reish Lakish rule consistently across different cases.
מַאי אִירְיָא (mai irya): Why specifically?. The Gemara questions why the mishna singled out a convert or maidservant rather than a native Israelite.
הַרְשָׁאָה (harsha'ah): Authorization or power of attorney. The Gemara investigates whether brothers of uncertain status can empower one another to collect an inheritance.
יוֹצֵא דּוֹפֶן (yotzei dofen): One born by caesarean section. The mishna debates whether a child delivered surgically qualifies as a firstborn for inheritance or redemption.