OXFORD 9000
📚 noun • entry_id 1814

mother-in-law

/ˈmʌ.ðəɹ.ɪnˌlɔː/
Meanings (ES + gloss)
suegra
The mother of one's spouse.
Odontophobia, or the fear of dental work, seems equally plausible, as does pentheraphobia - fear of the mother-in-law.