With over 19,000 entries, this reference work fulfills the need for an academic work that combines the concise presentation of a dictionary, with an etymology for each term, and includes the general terms one would meet while studying invertebrate zoology. Invertebrate zoology is not studied in isolation, therefore the more common terms from the fields of Anatomy, Animal Behavior, Ecology, Embryology, Endocrinology, Evolution, Genetics, Physiology, Taxonomy and Zoogeography, as well as many terms covering sizes, shapes, colors, forms and textures have been included. There is a comprehensive taxonomic coverage of every invertebrate phylum and many families and species that are of particular interest. Appendix 1 provides a brief, alphabetical, descriptive summary of the 37 invertebrate phyla, including the higher level taxonomy down to the level of family in most cases. Appendix 2 defines Biogeographical and Zoogeographical Regions. Appendix 3 is an Outline of Geological Time and provides information about the principle Eons, Eras, Periods, and Epochs, plus other geological time periods. Appendix 4 lists commonly encountered color terms. Appendix 5 is a brief bibliography. Additionally there is a brief introduction to scientific Latin and Greek. This dictionary is a standard reference and will be invaluable to anyone with an interest in Invertebrate Zoology.