also Teresa, fem. proper name, from French Thérèse, from Latin Therasia, apparently from Greek Therasia, name of two volcanic islands, one near Sicily, one near Crete. In the top 50 most popular names for girls born in the U.S. from 1953 to 1969.

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Definitions of Theresa from WordNet

Theresa (n.)
Indian nun and missionary in the Roman Catholic Church (born of Albanian parents in what is now Macedonia); dedicated to helping the poor in India (1910-1997);
Synonyms: Teresa / Mother Teresa / Mother Theresa / Agnes Gonxha Bojaxhiu