βάτελλα
From LSJ
Πάντα οὖν ὅσα ἐὰν θέλητε ἵνα ποιῶσιν ὑμῖν οἱ ἄνθρωποι, οὕτως καὶ ὑμεῖς ποιεῖτε αὐτοῖς· οὗτος γάρ ἐστιν ὁ νόμος καὶ οἱ προφῆται → Therefore as many things as you would like people to do for you, do also the same for them: that is the Torah, that is the prophets! (Matthew 7:12)
English (LSJ)
ἡ, = Lat. A patella, POxy.741.18 (ii A. D.):—Dim. βατέλλιον, τό, Ostr.1218, POxy.1657.5 (iii A. D.).