Ruis (áÂÂ) is the fifteenth letter of the Ogham alphabet, derived from ruise "red" or "reddening". The kennings refer to the reddening of the face caused by intense emotion, and medieval glossators also refer to the practice of reddening the cheeks with the juice of plants. Its Proto-Indo-European root was *hâÂÂreudð- 'red'. Its phonetic value is [r].
In the medieval kennings, called BrÃÂatharogaim or Word Ogham the verses associated with ruis are:
- "most intense blushing" in the BrÃÂatharogam Morann mic MoÃÂn
- "reddening of faces" in the BrÃÂatharogam Mac ind ÃÂc
- "glow of anger" in the BrÃÂatharogam Con Culainn.