The American Heritage® Student Science Dictionary covers a wide variety of fields, including:
chemistryphysics
biology 
geologymeteorologyastronomyecologyzoologymathand moreIts definitions are written in a clear and straightforward style that even beginning students can follow. An extensive cross-reference program encourages readers to build a more complex vocabulary.
The dictionary includes
more than 4,500 entry words with clear, easy-to-understand definitionsmore than 425 full-color photographs and drawings175 Feature Notes on important scientific concepts, the major discoveries of many scientists, and the usage and history of scientific terminologydetailed graphic treatment of selected subjects, such as the structure of atoms, photosynthesis, plate tectonics, and the life of starshandy tables and charts, including the periodic table of the elements, a chart of geologic time, and a timeline of advances in computing.The American Heritage® Student Science Dictionary is the ideal resource for homework assignments, school projects, general research, or just browsing. Get the key to unlocking the language of science and the natural world for students and their families.