πενθεράpentherá, pen-ther-ah'; feminine of G3995; a wife's mother:—mother in law, wife's mother.
Thayer's Greek Lexicon
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STRONGS G3994:
πενθερά, πενθερᾶς, ἡ (feminine of πενθερός, which see), a mother-in-law, a wife's mother: Matthew 8:14; Matthew 10:35; Mark 1:30; Luke 4:38; Luke 12:53. (Demosthenes, Plutarch, Lucian, others; the Sept. for חָמות.)