ὑμένιον
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
English (LSJ)
τό, Dim. of ὑμήν, Arist.HA497a21, 529a17, Ruf.Ren.Ves.11.6.
German (Pape)
[Seite 1178] τό, dim. von ὑμήν, Arist. H. A. 1, 17.
Greek (Liddell-Scott)
ὑμένιον: τό, ὑποκορ τοῦ ὑμήν, Ἀριστ. π, τὰ Ζ. Ἱστ. 1. 17, 17., 4. 4, 19.
Russian (Dvoretsky)
ὑμένιον: τό тонкая оболочка, пленочка Arst.