LSJ
ίδος, ἡ, (< σφαγή) nape of the neck where the axe strikes the bull, Poll. 2.134.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ἡ, = ἐπισφαγεύς, Poll. 2.134 Bekker, sonst ἐπισφαγιεύς.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)