ἔλικτρον

From LSJ

ὃ σὺ μισεῖς ἑτέρῳ μὴ ποιήσεις → don't do to others what you don't want them to do to you

Source

Spanish (DGE)

-ου, τό
cáscara del huevo, Anon.Alch.412.7, 439.3 (prob. por ἔλυτρον q.u.).