πυλωρός (pulōros)

a gate-keeper, warder, porter (see. πυλαωρός); (Aeschulus Tragicus); also as feminine, ἡ π. δωμάτων γυνή (Euripides):—;metaphorically, τοῖον πυλωρὸν φύλακα τροφῆς such a watchful guardian of thy life, (Sophocles Tragicus) (ML)