Dictionary Check: chain

British biochemist (born in Germany) who isolated and purified penicillin, which had been discovered in 1928 by Sir Alexander Fleming (1906-1979)

a series of things depending on each other as if linked together

(chemistry) a series of linked atoms (generally in an organic molecule)

a series of (usually metal) rings or links fitted into one another to make a flexible ligament

(business) a number of similar establishments (stores or restaurants or banks or hotels or theaters) under one ownership

anything that acts as a restraint