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drum, in music
(Encyclopedia) CE5 Drums drum, in music, percussion instrument, known in various forms and played throughout the world and throughout history. Essentially a drum is a frame over which one or more membranes or sk...e, in mathematics
(Encyclopedia)e, in mathematics, irrational number occurring widely in mathematics and science, approximately equal to the value 2.71828; it is the base of natural, or Naperian, logarithms. The number e is defined ...earth, in chemistry
(Encyclopedia)earth, in chemistry, metallic oxide not readily reducible by chemical means, e.g., alkaline earths, rare earths, and alumina. The name is also applied to certain absorbent clays, e.g., fuller's earth,...echidna, in zoology
(Encyclopedia)echidna ĭkĭdˈnə [key] or spiny anteater, animal of the order Monotremata, the egg-laying mammals. A short-legged, grayish brown animal, the echidna is covered with sharp quills and can protect its...echo, in acoustics
(Encyclopedia)echo, reflection of a sound wave back to its source in sufficient strength and with a sufficient time lag to be separately distinguished. If a sound wave returns within 1⁄10 sec, the human ear is in...dove, in zoology
(Encyclopedia)dove: see pigeon.Draco, in astronomy
(Encyclopedia)Draco [Lat.,=the dragon], northern constellation lying SE of Ursa Minor and N of Lyra and Hercules. It is traditionally depicted as a dragon. Draco contains the bright star Eltanin (Gamma Draconis). T...draft, in banking
(Encyclopedia)draft, in banking, order by one party to another party to pay a stated sum to the person or firm in whose favor the draft is made. It is similar in form to the ordinary bank check. Often the drawer an...antipodes, in geography
(Encyclopedia)antipodes [Gr.,=having feet opposite], people or places diametrically opposite on the globe. Thus antipodes must be separated by half the circumference of the earth (180°), and one must be as far nor...hoya, in botany
(Encyclopedia)hoya: see milkweed.Browse by Subject
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