THOMAS, St. an island belonging to Portugal, in the Gulf of Guinea, almost under the equator, in E. Long. 6.3. Area, 145 square miles. It is of volcanic formation, and has a peak in the centre 7020 feet high. The valleys are fertile, and the vegetation luxuriant; but the climate is very hot and unhealthy. Mazé, dates, sugar, indigo, cotton, &c., are produced here. Pop. from 15,000 to 20,000, mostly slaves. St Thomas, the capital, on the N.E. coast, is defended by a fort. Pop. 4000.