ἑπτάμυχος
From LSJ
ἡ γὰρ σιωπὴ τοῖς σοφοῖσιν ἀπόκρισις → silence, you see, is an answer for the wise (Menander)
English (LSJ)
ἑπτάμυχον, with seven recesses, σπέος Call.Del.65: title of work by Pherecydes of Syros.
Greek (Liddell-Scott)
ἑπτάμῠχος: -ον, ἔχων ἑπτὰ μυχούς, δηλ. πολλούς, ἑπτάμυχον σπέος, «πολύμυχον» (Σχόλ.), Καλλ. εἰς Δῆλ. 65.