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URO 



Inhabit the lakes and rivers of the United 

 States of America. 



U'NION BY THE PIRST INTENTION. A 

 phrase applied by surgeons to the healing 

 of wounds by adhesion, without suppu- 

 ration or granulation. 



UNIP'AHOUS, Lat. uniparus. Producing 

 one only at a birth. 



U'NISON, from units, and sonus, sound. 

 A term in music, implying that a string, 

 &c. gives a sound coincident with an- 

 other, proceeding from an equality in the 

 number of vibrations made in a given 

 time by the sonorous body. If two strings 

 of the same material have equal length, 

 thickness, and tension, their sounds will 

 be in unison. The term is applicable whe- 

 ther the sounds be produced by instru- 

 ments or the organs of the human voice. 



U'.MT. 1. Lat. *, one ; itnitas, unity. 



One. 2. Any determinate quantity, by 



the constant repetition of which any other 

 magnitude of the same kind is measured. 



UNITA'RIANISM. In theology, the doc- 

 trine of Unitarians, who contend for the 

 unity (unitas} of the Godhead, in opposi- 

 tion to the Trinitarians, and who, of 

 course, deny the divinity of Christ. 



U'NITY. 1. In mathematics, the ab- 

 stract expression for any unit whatso- 

 ever. 2. In poetry, the principle by 



which a uniform tenor of story, and pro- 

 priety of representation, is preserved. In 

 the drama, the unities are three ; the 

 unity of action, of time, and of place. 



U'NIT JAR. A small insulated Leyden 

 jar, placed between the electric machine 

 and a larger jar or battery, to announce 

 the number of discharges which have 

 passed into the larger jar. 



U'NIVALVE. 1. One-valved: univalvu- 



lar. 2. A shell which is complete in 



one piece. 



UNIVER'SALISM. In theology, the doc- 

 trine that all mankind will be saved or 

 made happy in a future state. 



UNIVEH'SITY. An establishment for the 

 purposes of instruction in science and 

 literature, and having the power of con- 

 ferring honorary dignities or degrees. 



U'PAS. The name given in Java to se- 

 veral deadly poisons, of which the Sohon 

 p<w and the upas tienti, are the most 

 celebrated. They belong to different 

 genera, and owe their poisonous proper- 

 ties to different principles. The Sohon 

 upas is a bitter gum-resin, which exudes 

 from incisions in the bark of a large tree, 

 called antiar or antshar by the Javanese, 

 and Antiaris toxicaria, or Ipo toxicaria 

 by botanists. It is a quick and rapid poi- 

 son. The Upas tiente is the produce of 

 the Strychnos tiente, and owes its deadly 

 effects to strychnia. The natives of Java 

 and the neighbouring islands used these 

 poisons to render their arrows more 

 tiddly. 



U'rrpA. The hoopoe: a genus of pas- 

 serine birds belonging to the family of 

 Tenuirostres. The species are character- 

 ised by an ornament on the head, formed 

 of a double range of long feathers, which 

 they can erect at will. 



U'RAMTE. Pechblende. One of the 

 ores of uranium, in which the metal is 

 combined with sulphur and a portion of 

 iron, lead, and silex. Colour greenish- 

 black. See URANIUM. 



URA'NICM. A very rare metal, dis- 

 covered by Klaproth in uranite or pech- 

 blende, found in the mine near Johann- 

 Georgen-Stadt, in Saxony. Another ore, 

 called green uranite, uran-mica. chalcolite, 

 &c., occurs in Cornwall. The ores are 

 reduced by various devices ; but the 

 metal when procured has so little lustre, 

 that its metallic nature can hardly be re- 

 cotrniscd by the naked eye. Sp. gr. about 9. 



URANOL'OGT, from oyjavas, heaven, and 

 Xx?> discourse. The science of the 

 heavens : astronomy. 



URANos'copr*. The star-gazer: a genus 

 of acanthopterygious fishes of the percoid 

 family, so named from ova.vog, heaven, 

 and e-xvTica,to view, because the eyes are 

 placed on the superior surface of the 

 nearly cubical head. 



U'RANCS, from w/javos, heaven. The 

 name now generally adopted for the 

 planet discovered by Dr. Herschel, and 

 called by him the Georgium sidus. 



URCE'OLATE, Lat. urceolatus. Pitcher- 

 shaped: bellied out like a common jug. 



UR'CHIN. 1. The hedge-hog (q.v.). 



2. The name sea-urchin has been given to 

 the Echinus (q. v.). 



U'REA. A constituent of urine. It 

 crystallises in four-sided prisms, which 

 are transparent and colourless, with a 

 slight pearly lustre. 



U'RETER, from ov$ov, urine. A name 

 in anatomy for the membraneous canal 

 which conveys the urine from the kidney 

 to the bladder. 



URE'THRA. The canal by which the 

 urine is voided. 



U'RIA. The guillemot: a genus of 

 birds, separated from the genus Colymbus, 

 Lin. , by Brisson. The wings are shorter 

 than those of the divers ; but they are 

 chiefly characterised by the absence of 

 the thumb. They live among rocky pre- 

 cipices, and feed on fish. 



U'RIC ACID. See LITHIC ACID. 



URN, Lat. urna. 1. A sort of antique 

 vase, which was chiefly used to preserve 

 the ashes of the dead, and hence called 

 Cineraria. 2. In mosses, it is the hol- 

 low urn in which the spores are lodged. 



UROS'COPT. The judgment of disease! 

 founded on an inspection of the urine. 

 UROFY'OIUM. cv(, a tail, and *v}-*, 





