UNIVALVE 



336 



URTICA 



Univalve shells. Having the shell in bat 



one piece. Land andfretk- 



water U. : mostly plant 



eaten, with entire mouths. 



Marine U. : carnivorous, 



with notched mouths. 

 Universe, ( u'ni-ve.rs ). [L. 



univertum, the whole.] The 



general system of all the 



stars visible, together with 



all other bodies influenced 



by them. 

 Universal. U. dicharge=. Univalve. 



an apparatus for discharging electricity, 



adapted to general use. U. joint = Ilooke's 



U. equiMrium, v. 



Equilibrium. 

 Unstratified, ( nn-strat'i-fid ). U. drift = 



Boulder clay; also called Till. U. roeki : not 



in layers or strata; formed by igneous forces, 



and not deposited in water; v. Formations. 

 Unukalkay=Unakalkay, 7.9. 

 Upas tree, (u'pas). [Malay; vpai, poison.] 



1. = Antiaris toxicaria : a 



tree belonging to Artooarpa- 



ceae. 2.=Strychnos tieute: 



a poisonous tree. 

 Upland -goose = Cloephaga 



Upper Miocene of France= 



Faluns, q.v. 

 Upupidse, (up'u-pi-de). [Up- 



upa, the typical genus.] A 



family of birds belonging to Upu t& 



Insessores=Hoopooes, q.v. 

 Ural-altaic. A primary divi 



T?ralite, (Q'ra-HtX [Ural Mountains.] A 

 mineral connecting the amphibole and 

 pyroxene varieties in one group. 



Uranates, (u'ra-nats). [Uranic, q.v.] Com- 

 pounds of uranic acid and bases. 



Uranic, (Q'ra-nik). [Uranium, q.v.]. Relating 

 to Uranium, q.v. 



Uranium, (u-ra'ni-um). [Ok. urannt, heaven.] 

 =U : one of the iron-like metals; a steel- 

 white malleable metal. 



Uranus, (u'ra-nus). [Gk. uranos, heaven. ]= 

 Georgium Sidus=Herschel: one of the Major 

 Planets, discovered in 1781 by Herschcl; has 

 four, and perhaps six, moons; distance from 

 the sun 1752 millions of miles; diameter 

 S3 '000 miles; year about 85 of ours; shines 

 with a yellow light 



Uranyl, (u'ra-nil). [Uranium, q.v.]=UaO2= 

 Oxide of uranium. 



Urates, (u'rats). [Uric, q.v.] Compounds of 

 uric acid and bases. 



Urceola, (er'se-o-la). [L. urceolut, pitcher.] 

 A plant belonging to Apocynacese. U. elat- 

 f tca=Caoutchouc vine. 



Urchin, (gr'chiu). [Urchone, the O.E. word.] 

 = Hedgehog, v. Erinaceus. Heart U.t., 

 belong to Echinoidea, q.v. Sea Cf.=Echi- 

 ii idea, q.v. 



Urea, (u're-a). [Urine, <7.v.]=CH 4 N 2 O=Carba- 

 mide: a colourless, crystalline, animal base; 

 an essential constituent of urine; the diamide 



of carbonic acid. Compound ureat: sub- 

 stances obtained from urea by part of its 

 hydrogen being replaced by an organic 

 radicle. Ethyl urtat: urea in which one 

 atom of hydrogen has been replaced by some 

 alcoholic radicle. 

 Uredinacese=Coniomycetes, q.v. 

 Ureides, (Q'ridz). (Urea, q:v.]=8alts of urea 

 -water: urea in which part of the hydrogen 

 is displaced by the radicle of an acid. J/onu- 

 reidu: compounds formed by combining one 

 atom of urea with an acid. 

 Ureter, (tt-rg'te. r). [The Greek word.] A tube 

 paarinfl from the kidney to the bladder, cun- 

 veying urine. 



Urethane=Carbamic ether, q.v. 

 Urethra, (u rC'thra). [The Greek word.] A 

 tube by which the bladder is emptied. 

 Uria=Guillemot, q.v. 



Uric acid. (Q'rik). [Gk. ouron, urine .]= 



GaH^jOg: a crystalline substance for. i id in 



urine. Uypcr U.: a modification <>( un< a< -id. 



Urine, (u riii). \Urina, the Latin word.) Tin; 



liquid which the kidneys secrete from the 



blood; holds in solution urea, uric acid, 4c. 



Urinary organs, (u'ri-na-ri). [Urine, q.v.]= 



Kidneys, ureters, bladder. U. calculi: M.i,y 



concretions sometimes deposited fioin urino. 



Urinometer, (u-ri-uom'e-tfr). (Urine, q.v.; 



Gk. metron, measure.] An instrument fur 



measuring the density of urine. 



Urn-mosses=Bryacete, q.v. 



Urochs, (Q'roks)=:Bo8 primigenius: an animal 



talonging to Bovidsa. cf. Aurochs. 



Urodela, (u-ro-de'la). [Gk. euro, tail; Jtlm, 



visible.] Salamanders, newts, &c.: am]>lii 



bious animals which retain the tail thr. n.-ii- 



out life, chiefly N. American; not known in 



Australia, ti. Africa, or Hindostan=Ichthyo- 



morpha. 



Una Major, (jr'sa ma'jor). [The Latin name.J 

 =Tlie Greater Bear: one ;" 

 of the northern con- 

 stellations, of which the 

 chief stars are Dubhe, 

 Merak, Phecda, Megrez, 

 Alioth, Mizar, and Al- 

 kaid. The constellation 

 is also known by the 

 names, The Plough, 

 David's Car, Bier of Urn Major. 

 Lazarus, and Charles's Wain. 

 Ursa Minor, (or'saiui'nor). [The Latin name.] 

 =The Lesser Bear: one of the northern con- 

 stellations; resembling the Greater Bear in 

 having the body and tail marked by seven 

 stars, the chief of which are Polaris (at the 

 end of the tail), and Kocab. 

 Ursidse, (gr'si-de). [Ureus, q.v.; Gk. cidos, 

 form.] A family of Mammalia, of which tho 

 bear ia the type. 



Ursus, (gr'sus). [The Latin name. ]= Bear: a 

 largeomnivoroushybernatinp quadruped. U. 

 Indicut: Indian badger. U. Malayanu*= 

 Helarctos = Malay bear. U. ptou*=Cave 

 bear. U. ^wio=Glutton. U.ferox- grisly bear. 

 Urtica. (er-ti'ka). [The Latin name.]=N<-t tit- 

 an herb, with stinging hairs, the type of 

 Urticaceae. U. urentissima^=I)Qvil'a bit. 



