The Penguin Dictionary of Biology

Worried about your maternal effect or biological clock? Need to know a rhizoid from a rhizome? Think you-re going to fail your zoology or botany exam? The Penguin Dictionary of Biology is your saviour, defining some 6000 terms relating to this rich, complex and constantly expanding subject - from amino acids, bacteria and the cell cycle to X-ray diffraction, Y chromosome and zygotes. Long established as the definitive single-volume source, this dictionary has sold over 200,000 copies and is extensively updated for its eleventh edition.