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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...

Abd al-Malik

(Encyclopedia)Abd al-Malik äbˌdo͝ol-mälĭkˈ [key], c.646–705, 5th Umayyad caliph (685–705); son of Marwan I. At his accession, Islam was torn by dissension and threatened by the Byzantine Empire. With the ...

Atlas, in astronomy

(Encyclopedia)Atlas, in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn XV (or S15), Atlas is a small, irregularly shaped (nonspherical) body measuring about 25 mi (40 km) ...

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...

Eris, in astronomy

(Encyclopedia)Eris, in astronomy, the largest known dwarf planet. Eris, whose highly eccentric elliptical orbit ranges from 38 AU to 97 AU and is inclined more than 44°, is the largest known object of the Kuiper b...

Prometheus, in astronomy

(Encyclopedia)Prometheus prōmēˈthēəs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn XVI (or S16), Prometheus is an irregularly shaped (nonspherical) body me...

nymph, in zoology

(Encyclopedia)nymph, in zoology: see insect.

memory, in computing

(Encyclopedia)memory, in computing: see computer. ...

mine, in industry

(Encyclopedia)mine, in industry: see mining.

mode, in grammar

(Encyclopedia)mode, in grammar: see mood.