The word "invex" is an uncommon word that is not found in most dictionaries. It is spelled using the IPA phonetic transcription as /ɪnˈvɛks/. The first syllable is pronounced as "in", while the second syllable is pronounced as "vex" with emphasis on the second syllable. The word invex is believed to be a mathematical term describing a function that has a convex graph when the inverse of its graph is drawn. Despite its rarity, invex remains an intriguing word for those interested in mathematics and linguistics.