Liddell-Scott-Jones

ὄμφαξ (omphax) an unripe grape ^G:N-F

ὄμφαξ, ᾰκος, ἡ

(ὁ [Refs 1st c.AD+], unripe grape [Refs 8th c.BC+],Acut.(Sp.) [Refs 5th c.BC+]; also of other fruits, as olives, [Refs 2nd c.AD+]

__II metaphorically, young girl not yet ripe for marriage, [Refs 1st c.BC+]; τί τρυγᾷς ὄμφακας ἡλικίη; (epitaph of a boy, addressed to Pluto) [Refs]
__II.2 the unripe hard breasts of a young girl, ὄμφακα μαζοῦ [Refs 3rd c.AD+]; but ὄμφακι μαζῷ, as adjective, [Refs 4th c.AD+]
__II.3 ὄμφακας βλέπειν look sour grapes, look sour (compare βλέπω II), [Refs] your scornful brows and sourgrape looks, [Refs 5th c.BC+]
__II.3.b proverbial, ὑγιέστερος ὄμφακος [Refs]
__II.4 a gem, used for seals, [Refs 4th c.BC+]. [Always ᾰ, since στόμφᾱκα has been restored by Gaisf. in [Refs 5th c.BC+]