Found 2 items, similar to mother-in-law.
English → English (WordNet) Definition: mother-in-law mother-in-law n : the mother of your spouse [also: mothers-in-law (pl)]
English → English (gcide) Definition: Mother-in-law Mother-in-law \Moth"er-in-law`\, n. The mother of one's husband or wife. [1913 Webster]