ballaenaceus
From LSJ
λέγεις, ἃ δὲ λέγεις ἕνεκα τοῦ λαβεῖν λέγεις → you speak, but you say what you say for the sake of gain (Menander, fr. 776)
ballaenaceus ballaenacea, ballaenaceum ADJ :: made of whalebone
ballaenāceus, a, um (ballaena), von Fischbein, Petr. 21, 2.