If you are reading along in a book or on the web and come across the word angiosperm, this little gem will tell you that it is, "A flowering plant whose seeds are housed within an ovary." And, that heading is followed by a couple of paragraphs that clearly describe angiosperm as the opposite of gymnosperm, plants "whose seeds are not protected in an ovary".
Moving through the alphabet, you'll find bramble, compost, fragrant, ground cover, inflorescence, metamorphosis ... well, you get the idea.
This one is an easy to hold paperback size at 8 by 8 inches and 224 pages. The list price is around $17 and on the Internet it is available for around $14. Pick one up for a friend or a family you know.