Mother-In-Law
From BiblePortal Wikipedia
Vine's Expository Dictionary of NT Words [1]
1: Πενθερά (Strong'S #3994 — Noun Feminine — penthera — pen-ther-ah' )
the feminine of pentheros ("a father-in-law"), occurs in Matthew 8:14; 10:35; Mark 1:30; Luke 4:38; 12:53 (twice).
Webster's Dictionary [2]
(n.) The mother of one's husband or wife.