powerful explosive consisting of a mixture of nitroglycerine with an absorbent, 1867, from Swedish dynamit, coined 1867 by its inventor, Swedish chemist Alfred Nobel (1833-1896), from Greek dynamis "power" (see dynamic (adj.)) + -ite (2). Figurative sense of "something potentially dangerous" is from 1922. Positive sense of "dynamic and excellent" by mid-1960s, perhaps originally African-American vernacular.
intelligence test, first published 1916 as a revision and extension of the Binet-Simon intelligence tests, from Stanford University (California, U.S.) + the name of French psychologist Alfred Binet, who devised the attempt at a scientific measurement of intelligence.