SILICEOUS 



304 



SIPHON 



Siliceous, (si-lish'us). [Silex, q.v.] Flinty. 

 S. rocks: sandstones of flint -grains. 



Silicic, (si-lis'ik). [Silica, q.v.] S. acieZ=SiO 2 

 = S. anhydride = Silica: has feeble acid 

 properties. S. ether = (C^R 5 )^SiO s = 

 Diethyl silicate. S. tetra-fluoride=luoride 

 of silicon : a fuming gas, which acts on 

 gloss. 



Silicides, (sil'i-sldz). [Silica, q.v.] Compounds 

 of silicon with a metal. 



Silicium, (si-lisb'i-um). [Silica, g.v.]=Silicon, 

 q.v. 



Silicon, ( sil i-kon). [Silica, q.v.]= Silicium = 

 Si"": the chief constituent of flint : a very 

 abundant solid element. S. group of 

 7Jiinmifs=Silicon, titanium, tin, zirconium : 

 tetrad elements. 



Silicula, (si-lik'u-la). [The Latin word.] A 

 fruit, consisting of a frame and two valves, 

 a short variety of the siliqua. 



Siliqua, (sil'ik-wa). [The Latin word.] A long 



fruit, consisting of a frame, to which the 

 seeds adhere, and two valves, which open 

 one on either side. 



Siliquosse, (sil-i-kwo'se). [Siliqua, q.v.}= 

 Crucifers. v. Brassicacew. 



Silk, (silk). [Seolc, the A.-S. word.] A fine 

 strong thread, 

 produced by 

 the silkworm. 

 S. cotton =Bom- 

 bax ceiba. S. 

 7HO<A=Bombyx 

 c i n t h i a. 5. 

 worm = Bom- 

 byx mori. 



Sillago, (sil'la- Silkworm. , 



go). S. dowitna=Lady-flslj. 



Sillimanite, (sil'li-man-It). A mineral, chiefly 

 silicate of aluminum. 



Sillock, (siriok)t=Merlangnscarbonarius: also 

 all.-il Coal-tish. 



Silurian, (si-lu'ri-anX [Silures, ancient in- 

 habitants of Shropshire, &c.] A division of 

 Primary rocks, between the Devonian and 

 Cambrian, occupying nearly all Wales, and 

 large tracts in N.England, Scotland, Ireland, 

 and in Europe generally; also in America 

 and Australia: characterised by abundance 

 of brachiopod fossils. 



Siluridse, (si-lu'ri-de). [Silurus, q.v.; Gk. 

 eidos, form.] Sheat fishes: a family of fishes 

 belonging to Malacopterygii. 



Siluroid, (si-lu'roid). [Silurus, q. v.; Gk. eidos, 

 form.] S. fishes=Si\UTidsB, q.v. 



Silurus, (si-lu'rus). A large fish, the type of 

 Siluridse. 



Silver, (sil'ver). [Silfor, the A.-S. word.]= 

 Argentum=Ag / : one of the noble metals; a 

 white, hard, malleable, tenacious, lustrous 

 metal; valuable for its beauty, and as a good 

 conductor of heat and electricity. S. fir=. 

 Abies picea. S. fulminate, v. Fulminates. 

 S. firan<;e=Sulphide of Silver=Ag2S=Argen- 

 tite, q.v. S. group of minerals: includes 

 silver, kerate, argentite, stephanite, pyrar- 

 gyrite, and proustite. S.-haired monkey = 

 Grison. S. <ree=Arbor Dianae, q.v. S. iceed 

 =Potentillaansepina. Horn S. =Kerargyrite. 



Nickel S.=German S.: an alloy of copper, 



nickel, and zinc.- 

 Simaruba, (8im-a-r6'ba)=Qua8sia, q.r. : the 



type of Simarubacese. 

 Simarubaceae, (sim-a-ro-ba'se-e). [Simaruba, 



r/.v. Quassiads : bitter tropical trees ami 



shrubs, belonging to Ku tales. 

 Simia, (sim'i-a). [The Latin name.]=Pitho- 



cus, q.v. S. wara=Negro monkey. S. syl- 



vanws=Barbary ape. 

 Simiadae, (si-mi'a-de). [Simia, q.v.; Ok. eido*, 



form.] Apes and monkeys; a sub-division of 



Primates, q.v. 

 Simoom, (ai-moom'). [Arabic, samma, pot.] 



A hot dry wind, blowing from April to June. 

 Simosaurus, ( sim-o-saw'rus ). [Gk. timnx, 



snub-nose, tnura, lizard.] A genus of Plesio- 



sauria, q.i\: extinct marine reptiles. 

 Simple equation. One in which all the terms 



are of the first power only, as *H-9=8ar-24. 

 Sinai. Manna o/S.=Manna. 

 Sinapine, (sin'a-pin). [Sinapis, q.v.]= :C] fi Ho 3 



NO.v An alkaline substance found in wniM 



mustard. 

 Sinapis, (si-na'pis). [The Latin name.] Wus- 



tai-d: a plant belonging to Brassicaceae; also 



considered as a sub-genus of Brassica, q.v. S. 



dibit: white mustard. S. arvi*w=Charlock. 

 Sinapoline, (sin-ap'o-lln). [Sinajns, q.v.] A 



crystalline base, obtained from mustard. 

 Sincipital, (sin-sip'i-tal). [Sinciput, q.v.] Re- 

 lating to the sinciput. 

 Sinciput, (sin'si-put). [L. semi, half; caput, 



head.] The upper part of the In-ail. 

 Sine, (sin). [L. sinus, curve.] In any right- 

 angled triangle, the ratio ,/ 



of the side opposite an 



angle to the hypothennse 

 is the fiine of that angle; 



e -ff-> sF* 



at angle 

 of angle 



dab; also ^= Sine of angle 



adb. S. compass : a mag- 

 netised needle suspended Sine, 

 at the centre of a vertical circuit, so arranged 

 that when a current passes, and the coil and 

 needle are in the same vertical plane, the sine 

 of the angle through which the needle is de- 

 flected is the measure of the intensity of the 

 current. 



Sinew, (sin'Q). [Sinewe, the A.-S. word.] 

 Tendon, q.v. 



Singing. In liquids that are approaching the 

 boiling point, caused by the rapid production 

 of bubbles of vapour and their immediate ra- 

 condensatvon by the cooler liquid above them. 



Singing-flame. A flame in a tube, over which 

 the air in passing vibrates legularly, so as to 

 produce musical sounds. 



Smistrorsai. (sin-is-tror'- 

 sal). [L. sinister, on the 

 left hand; orsus, bejrun.J 

 =Left-handed spiral. 



Sioux, (se'o). A tribe of N. 

 American Indians. 



Sipeira= Green-heart, q.v. 



Siphon, (si'fon). [Gk.sip/ion, ' 

 tube.] A bent tube, having Siphon. 



