HYDRAZINE Meaning of HYDRAZINE in English [ 'hʌɪdrəzi:n ]■ noun Chemistry a volatile alkaline liquid with powerful reducing properties, used in some rocket fuels. [N 2 H 4 .]OriginC19: from hydrogen + azo- + -ine 4 . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004