παρακοιμητής
From LSJ
τούτων γάρ ἑκάτερον κοινῷ ὀνόματι προσαγορεύεται ζῷον, καί ὁ λόγος δέ τῆς οὐσίας ὁ αὐτός → and these are univocally so named, inasmuch as not only the name, but also the definition, is the same in both cases (Aristotle, Categoriae 1a8-10)
English (LSJ)
οῦ, ὁ,
A guard, ib.
German (Pape)
[Seite 484] ὁ, der Daneben- oder Dabeischlafende, Beischläfer; auch παρακοιμιστής, Paul. Aeg.