A comprehensive reference providing current definitions for 133,007 terms in 124 areas of science and technology (The editor characterizes it as "the largest scientific dictionary ever compiled in the English language.). A special feature of the Dictionary is the inclusion of boxed essays providing brief overviews for each of the 124 fields covered, contributed by leading figures in each field. Black-and-white illustrations are sprinkled throughout and there are 24 glossy pages of color photos.