Bekhorot 19: words to know

יוֹצֵא דּוֹפֶן (yotzei dofen): An offspring born by caesarean section. The Mishna discusses whether a caesarean-born animal or the offspring following it attains firstborn sanctity.
פֶּטֶר רֶחֶם (peter rechem): That which opens the womb. Cited as the Torah's requirement that disqualifies an animal not born naturally from firstborn sanctity.
מְחַוַּורְתָּא (meḥavarta): It is clear. Used to definitively conclude the discussion in favor of Abaye's interpretation over Ravina's.
חָיֵישׁ לְמִיעוּטָא (ḥayeish lemi'uta): Concerned for a minority. The Gemara suggests that Rabbi Yishmael follows Rabbi Meir's view that halakha accounts for the minority.
רוּבָּא דְּאִיתֵיהּ קַמַּן (rubba de'iteih kamman): A majority that is physically present before us. Introduced to distinguish an evident, tangible majority from a purely statistical majority.