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PREFACE TO THE
THIRTEENTH EDITION
Since the publication of the Twelfth Edition of Henderson’s Dictionary ofTHIRTEENTH EDITION
Biological Terms new words have entered the biological vocabulary and old ones
have acquired new or more precise usages. Progress in genetics, cell biology and
biotechnology continues to be rapid, driven by the genome-sequencing programmes,
bioinformatics, the use of gene manipulation and advances in experimental cell
biology.
The classification of the living world followed in this edition reflects the division
of all living things into three domains or superkingdoms. Entries in the body
of the dictionary are given for all the main phyla, divisions and classes of plants,
fungi, animals, protists and prokaryotes (Bacteria and Archaea), with some orders
being included for groups such as the insects, birds, mammals and flowering plants.
There are also entries under many common names of organisms. The appendices
at the back give a fuller outline of the various kingdoms. Viruses are covered by
entries for the main groups and in an appendix.
Terms are arranged in strict alphabetical order, disregarding hyphenation and
spaces between words, with abbreviations and acronyms included in their appropriate
place within the body of the dictionary. Numbers, Greek letters, and configurational
letters at the beginning of chemical names are ignored for alphabetization purposes.
Within an entry, different meanings of a term are numbered and separated
by semicolons. The abbreviations (bot.), (zool.), etc. have been used in some cases
to indicate more clearly which subject area a definition refers to. Almost all the
technical terms that may be used as part of a definition are defined within the
dictionary; to avoid complicating the text with excessive cross-referencing, such
terms are not generally indicated by (q.v.) within the body of an entry.
Common suffixes and prefixes derived from Latin and Greek are entered in
the body of the dictionary, along with their usual meanings, and Appendix 8 gives
etymological origins of some common word elements.
I should like to thank the staff of Longmans for their help and encouragement
throughout the project. Comments concerning errors or omissions in this edition will
be greatly appreciated, so that they may be rectified in future reprints or editions.
Eleanor Lawrence
London, 2004
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