OND 



733 



UNI 



delicacies, as the oyster green laver and 

 Meld laver. 



UM'BEL, 1 A species of inflorescence, 



UMBEL'H. ) consistingof several nower- 

 stalks, nearly equal in length, spread 

 from one centre, their summits forming a 

 level, convex, or even globose surface. It 

 is called rundle by some authors. 



ImBEtLA'T.. One of Linnaeus' natural 

 classes of plants, comprising such as have 

 the flowers growing in umbels. Parsley 

 i* an example. 



SBB^: ^al or little umbel. 



UM'BER. Brown ochre. 1. In ornitho- 

 logy, an African bird, the Scopus umbretta, 

 Erisson, so named from its umber or 



brown colour. 2. An earthy mineral 



of a brown colour, found in Cyprus. It is 

 used as a pigment. 



UMBI'LICAL CORD. In botany, an elon- 

 gation of the placenta in the form of a 

 cord. 



UMBII/ICUS. 1. The navel. 2. In bo- 



tany, formerly the generic name of the 

 wail pennywort, and yellow navel-wort, 

 now placed in the genus Cotyledons. 



3. In geometry, synonymous with/ociw. 



4. In conchology, the depression in the 

 centre, round which the shell is convo- 

 luted. 



UM'BO. 1. The pointed boss of a shield. 

 ^2. In botany, the knob in the centre 

 of the pilus, or hat of the fungus tribe. 



UM'BRA. A shadow. In astronomy, ap- 

 plied to the dark cone projected from a 

 planet or satellite, on the side opposite 

 the sun. 



UMBRELLA. 1. A well-known article 

 of defence against rain. &c. The name 



is the Latin dim. of umbra, a shade. 



2. A genus of sea-slugs. 



UM'PIRE, Lat. imperium. 1. A person to 

 whose sole decision a controversy or 



question between parties is referred. 



2. A third person called in to decide a 

 question submitted to arbitrators, when 

 the arbitrators do not agree in opinion. 



UN'CIA (Lat.). The twelfth part of any- 

 thing. The term was formerly applied 

 both to an ounce and an inch. 



UN'CIFORM, from uncus, a hook, and 

 forma, a likeness ; hook-like. Applied to 

 bones. The unciform bone is the last bone 

 of the second row of the carpus. 



UNCOM'MOS CHORD, in music, is another 

 term for the chord of the sixth. 



fxco.xFOR'MABLB. Not conformable. 

 Applied in geology to strata lying in a 

 different plane from the subjacent strata, 

 upon which they rest. 



UNDEC'AGON, from undeeim, eleven, and 

 yjitict,, angle. A geometrical figure of 

 eleven angles and sides. 



UNDERSHOT-WHEEL. In hydraulict, a 

 whwl with a number of flat board* which 

 xelre the impulse of the water con- 



eyed to the lowest part of tha wheel toy 

 n inclined canal, in contradistinction to 

 n oftrthot u-heel. 



UNDERPIN'ING. In architecture, bring- 

 ng a wall up to the ground-sill. It 



sually denotes such alterations as are 

 made on the foundations of walls as re- 

 quire them to be supported by strong tim- 

 ber shears and needles. 



UN'DEKTOW. A current below the sur- 

 face of water different from that above. 



UNDERWRITER. An insurer. See IN- 

 SURANCE. 



UN'DULATE, Lat. undjilatus, waved. 

 Having a waved surface. Applied to 

 leaves whose margins are waved obtusely 

 up and down. 



UNDULA'TION. In physics, a species of 

 motion transmitted successively through 

 different parts of a medium, without ten- 

 dency to continue that motion without 

 renewed impulses. Sound proceeds by 

 undulations in the atmosphere. 



UN'DULATORY THEORY. In optics, the 

 hypothesis according to which light is 

 transmitted by the undulations of an 

 elastic medium. 



UN'FORMED STARS. In astronomy, such 

 as are not included in any of the constel- 

 lations. 



UN'GUAL, from unguis, a nail or claw. 

 An epithet applied to bones which have 

 attached to them a nail or claw. 



UNGUIC'ULATA. A primary division of 

 the class mammalia, having the digits 

 armed with claws. 



UN'GUIS or CLAW. The narrow part of 

 the base of a petal. A measure of length 

 equal to half an inch* 



UN'GCLA, Lat. hoof. In geometry, a solid 

 formed by cutting off a part of a cylinder, 

 cone, &c., by a plane cutting the base ob- 

 liquely. 



UNGUL'ATA. An order of mammalia 

 having the feet ungulate or enveloped in 

 hoofs. 



UN'OTLATE. 1. Hoofed : nngula, a 

 hoof. 2. Shaped like a hoof. 



UNICAP'SULAR, Lat. unicapsularis, hav- 

 ing one capsule to each flower. 



U'NICORN-. An animal with one horn : 

 unus, one, and eor;m,a horn. The unicorn 

 is nowhere else to be found than as a 



supporter of the British arms. 2. The 



narwhal is sometimes named the tea- 

 unicorn. 



UNIFOR'MITT. The act of uniformity is 

 an act of parliament by which the form 

 of public prayers, administration of sacra- 

 ments and other rites, is prescribed to be 

 obserred in all the churches. 



U'NIO. 1. A pearl. 2. A genus of tes- 

 taceous acephala belonging to the family 

 Jlytilacea, commonly called fresh-water 

 muscles. The unios inhabit fresh water, 

 preferring running streams. Numrroui 

 species, remark? We for size or form, 



