Thomas Hill, an American clergyman, born in New Brunswick, N. J., Jan. 7, 1818. He was left an orphan at 10 years of age, and at 12 was apprenticed to the printer of a newspaper, where he remained four years. He then entered an apothecary's shop, after a year's attendance at school, and served in it 3 1/2 years. He graduated at Harvard college in 1843, completed his term of residence at the divinity school in 1845, and was settled at Waltham, Mass., on Christmas of the same year. He has published an "Elementary Treatise on Arithmetic," "Geometry and Faith," and "First Lessons in Geometry." It is, however, in his investigations in curves that he has displayed the greatest originality and fertility. He has added to the number of known curves, and simplified their expression; and by overstepping the common methods of using coordinates, and introducing new combinations, he has vastly extended the field of research. In 1859 he became president of Antioch college, at Yellow Springs, Ohio, and in 1862 of Harvard university.

He resigned the latter office in 1868, resided for some years at "Waltham, and is now (1874) pastor of a Unitarian church at Portland, Maine.