calamochnus
From LSJ
οὕτω τι βαθὺ καὶ μυστηριῶδες ἡ σιγὴ καὶ νηφάλιον, ἡ δὲ μέθη λάλον → silence is something profound and mysterious and sober, but drunkenness chatters
călămochnus: i, m. κάλαμος-χνοῦς,
I a kind of sea-foam; called in pure Latin adarca, Plin. 32, 10, 52, § 140.