μητρομήτωρ
From LSJ
ἑτέρως ἠδύνατο βέλτιον ἢ ὡς νῦν ἔχει κατεσκευάσθαι → otherwise they could have been constructed better than they are now (Galen, On the use of parts of the body 4.143.1 Kühn)
English (LSJ)
Dor. ματρομάτωρ, ορος, ἡ,
A mother's mother, grandmother, Pi.O.6.84, Ael.NA11.16.
German (Pape)
[Seite 180] ορος, ἡ, Mutter der Mutter, Großmutter mütterlicher Seits; Ael. N. A. 11, 16; Pind. Ol. 6, 84, in dor. Form ματρομάτωρ.
Greek (Liddell-Scott)
μητρομήτωρ: Δωρ. ματρομάτωρ, ορος, ἡ μήτηρ τὴς μητρός, μάμμη, προμήτωρ, Πινδ. Ο. 6. 143· παρ’ Ὁμ. μητρὸς μήτηρ Ὀδ. Τ. 416.