Bekhorot 43: words to know

גְּזֵירָה שָׁוָה (gezeira shava): hermeneutic textual analogy between identical words. Used to link blemishes of animals and priests via common terms.
מַפְנֵי (mafnei): free, superfluous for exposition. Indicates the words in the gezeira shava cannot be logically refuted.
שֶׁשָּׁוֶה בְּזַרְעוֹ שֶׁל אַהֲרֹן (she-shaveh be-zaro shel aharon): physically typical among Aaron's descendants. Defines a requirement for priests serving in the Temple.
אַחוֹלֵי עֲבוֹדָה (aḥolei avoda): profaning the sacrificial Temple service. Distinguishes between a biblical blemish and an atypical bodily feature.
מַרְאִית הָעַיִן (mar'it ha-ayin): appearance of impropriety; deceptive looks. Serves as a rabbinic ground to disqualify a priest from service.