2. A skin wrinkle.
From the Greek rhytis, meaning "wrinkle".
Botox is used in the treatment of some rhytid conditions
Botox has been used primarily for treating rhytids of the upper face. Its use in the lower part of the face (chin rytids) has been reported by several people, but there is a relative scarcity of information regarding the use of Botox in the chin and even fewer well controlled studies in this area.