A classic basic biology dictionary. The appendices include an outline classification of living organisms. A Philosophical Dictionary of Biology. P. B. Medawar, and J. S. Medawar. A dictionary of philosophical concepts in biology.
Entries range in length from a single paragraph to several pages.
Dictionary of Theoretical Concepts in Biology. Keith E. Roe, and Richard G. Frederick. This is not a dictionary but a bibliography which provides citations to original sources and reviews which discuss the concept in question. Covers all fields of biology. A Guide to the Language of Biology.