a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty
the most favorable environment for a plant or animal; "water is the element of fishes"
a straight line that generates a cylinder or cone
the situation in which you are happiest and most effective; "in your element"
one of four substances thought in ancient and medieval cosmology to constitute the physical universe; "the alchemists believed that there were four elements"
an enclosure of residences and other building (especially in the Orient)
a whole formed by a union of two or more elements or parts
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
of leaf shapes; of leaves composed of several similar parts or lobes
consisting of two or more substances or ingredients or elements or parts; "soap is a compound substance"; "housetop is a compound word"; "a blackberry is a compound fruit"
put or add together; "combine resources"
combine so as to form a whole; mix; "compound the ingredients"