ἐπιδερμίς
From LSJ
Περὶ τοῦ ἐπέκεινα τοῦ νοῦ κατὰ μὲν νόησιν πολλὰ λέγεται, θεωρεῖται δὲ ἀνοησίᾳ κρείττονι νοήσεως → On the subject of that which is beyond intellect, many statements are made on the basis of intellection, but it may be immediately cognised only by means of a non-intellection superior to intellection
English (LSJ)
ίδος, ἡ,
A outer skin, epidermis, Hp.Nat.Puer.20, etc. II. web of water-birds' feet, Arist. ap. Sch.Il.2.460.