An illustrated dictionary defining scientific terms from "aa" to "zygote."

This updated edition features nearly 200 new entries added to the more than 30,000 words with clear, understandable definitions that invite readers to interact with the words and definitions. Features a pronunciation guide and boxes offering extra facts.

With an alphabetical listing of more than 15,000 words, useful rules, and an index of commonly misspelled words, this guide can help any student conquer the spelling dilemma. Illustrations.

More than two thousand entries, in subjects from astronomy to zoology, are accompanied by tables and charts, as well as biographies of eighty-five scientists.

New and Updated for 2009 and beyond!

An illustrated dictionary defining scientific terms from "aa" to "zygote."

Presents definitions for over 1,500 head words and includes some 600 color photographs.