πενθερ-ά,
Ionic dialect πενθερή, ἡ, feminine of πενθερός, mother-in-law, [[ 4th c.BC: Demosthenes Orator 45.70, 3rd c.BC: Callimachus Epicus “Hymnus in Dianam” 149, NT.Mark.1.30, 1st-2nd c.AD: Plutarchus Biographus et Philosophus “Tiberius Gracchus” 8, etc. ] NT+4th c.BC+]