The realization international `Conventions on prohibition of development, manufacture and accumulation of stocks of the bacteriological (biological) and toxic weapon and about their destruction` (Geneva, 1972) has put a complex problem to secure the experts engaged in objects of chemical disarmament, population of near-by areas and the environment protection. So arisen a new seemed limited but extremely important area of engineering with an original language and specific layer of a terminology. The dictionary is based on the American English and contains about 12,000 entries. The dictionary is complemented by the abbreviations accepted in this sphere of activity both in English-Russian, and in Russian-English variants. The dictionary is a useful manual of today for everyone engaged in translation and summaries of the specialized texts in English and Russian, who reads in these languages and studies them.