A dictionary which defines a total of 9178 terms relevant to discussions of land plants, aquatics, algæ, fungi, lichens, fossils, plant communities, scientific terminology with respect to nomenclature, epochs, study disciplines and associated tools, plant habitats, actions, and products. In addition, it includes terms relating to plants found in literature, or in mythology, or in religions, and even some confusing terms which seem to refer to plants but do not. Grammatical details relevant to correct use, such as plurals for nouns deriving from other languages, data on etymology of a variety of words now used in English but devised elsewhere, and notes on how to correctly pronounce these words.