sentinel
From LSJ
Τραφὲν ὄρεσι καὶ φάραγξιν ἀγρίαις, κήρυξ πέφυκα τῆς λόγου ὑμνῳδίας. Φωνήν μὲν οὐκ ἔναρθρον, εὔηχον δ' ἔχω (Byzantine riddle) → Raised in the mountains and wild ravines, I have become the herald of hymns that are sung. I have no articulate voice...
English > Greek (Woodhouse)
substantive
P. and V. φύλαξ, ὁ, φρουρός, ὁ.
stand sentinel, v.: Ar. and P. προφυλάσσειν.