Mother Te ‧ re ‧ sa /ˌmʌðə təˈriːzə $ -ðər-/ BrE AmE
someone who is very kind, unselfish, and morally good is sometimes compared to Mother Teresa, an Albanian Roman Catholic ↑ nun (=a member of a group of Christian religious women) who lived in India where she worked to help the poor and the sick in the city of Calcutta