often with out, by 1973, U.S. colloquial, from bliss (n.).
Sullivan Sul·li·van, Harry Stack. 1892-1949.
American psychiatrist who theorized that personality is largely determined by one's interpersonal relations and the assimilation of societal values.
British mathematician, astronomer, and physicist who founded modern astrophysics. He conducted research on the evolution, structure, and motion of stars and was one of the first scientists to promote the theory of relativity. He also wrote a series of scientific books for the layperson.