κλητικός
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)
ή, όν,
A ofor for invitation, Men.Rh.p.424 S.; σχῆμα Hermog.Inv.4.3. 2 invocatory, ὕμνοι Men.Rh.p.333 S.; τύπος Id.p.334 S. 3 Gramm., vocative, ἡ -κή (sc. πτῶσις) D.T.636.7, A.D.Pron.6.9, al.; σύνταξις Id.Synt.46.8; τὸ κ. ὦ Hdn.Gr.1.473.
German (Pape)
[Seite 1452] zum Rufen, zum Namen gehörig; ἡ κλητική, sc. πτῶσις, casus vocativus, Gramm.