Biology 

Chambers 21st Century Dictionary
Contains words that have come into the language over the past two to three years.

Collins Dictionary of Biology
Covers all the major fields within the science, including anatomy, biochemistry, ecology, evolutionary theory, genetics, molecular biology, physiology and taxonomy.

Dictionary of Developmental Biology and Embryology
Covers classical morphological and cytological terms along with those from modern genetics and molecular biology. Extensively cross-referenced, the Dictionary includes definitions of terms, explanations of concepts, and biographies of historical figures. Comparative aspects are described in order to provide a sense of the evolution of structures.