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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...archangel, in religion
(Encyclopedia)archangel ärkˈānjəl [key], chief angel. They are four to seven in number. Sometimes specific functions are ascribed to them. The four best known in Christian tradition are Michael, Gabriel, Raphae...key, in mechanics
(Encyclopedia)key, in mechanics: see lock and key. ...Arethusa, in botany
(Encyclopedia)Arethusa: see orchid.argonaut, in zoology
(Encyclopedia)argonaut, in zoology: see paper nautilus. ...Browse by Subject
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