ïï Shi'a-This group thought that the caliph should be a relative of the Prophet, and so they rejected the Umayyads' authority. Shi'a means the party of Ali, and they sought revenge for Ali's death. Even though the caliphate continued for many years, the split contributed to its decline as a political system.
Rhinorrhea or rhinorrhoea is a condition where the nasal cavity is filled with a significant amount of mucus fluid.
Rotavirus is a virus that can cause severe diarrhea, usually with fever and vomiting. It is the leading cause of diarrhea in infants and young children in the United States and worldwide. Rotavirus can also occur in adults. An adult rotavirus infection is less common and usually less severe.