σύντασις
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
English (LSJ)
εως, ἡ,
A tension, rigidity, ὑποχονδρίου Hp.Epid.1.12, cf. 1.26.β, 2.3.6, Arist.Pr.879b17, Sor.2.17, Gal.6.198, 15.609. 2 vehement effort, exertion, Pl.Smp.206b, Phlb.46d.