antachates
From LSJ
ὤδινεν ὄρος, Ζεὺς δ' ἐφοβεῖτο, τὸ δ' ἔτεκεν μῦν → the mountain was in labor — even Zeus was afraid — but gave birth to a mouse
antăchātēs: ae, m., = ἀνταχάτης,
I a precious stone, Plin. 37, 10, 54, § 139, where Jan reads aethachates; others still, autachates.