OLECRANOID 



892 



OLFACTORY 



as-e , o-lek-ran-ok' -as-e) [i>\inpavov, the head of the 

 elbow; apdpov, joint ; /ca/«5c, evil]. Inflammation of 

 the elbow-joint. 



Olecranoid (o - lek' - ran - oid) [ioAeicpavov, head of the 

 elbow; eldog, like]. Resembling the olecranon. O. 

 Fossa, the fossa at the dorsal side of the distal end 

 of the humerus for the reception of the olecranon. 



Olecranon (o-lek' '-ran-on) [uAEKpavov ; utevij, elbow ; 

 Kpdviov, head]. The large process forming the head 

 of the ulna. 



Olefiant Gas {o-lef'-e-ant^oleum, oil ; ficare, to make]. 

 Heavy oil of carbon. See Ethylene. 



Olefin (o'-lef-in) [oleum, oil; ficare, to make]. The 

 name of a series of unsaturated hydrocarbons contain- 

 ing two hydrogen atoms less than the paraffins or 

 ethanes, C n H 20 . They are produced with paraffins 

 in the dry distillation of many complicated carbon 

 compounds ; hence their presence in illuminating gas 

 and in tar-oils. The lower members of the series are 

 gases ; the intermediate members, ethereal liquids ; 

 the higher (from C 16 H 32 up), solids. They boil at 

 points a few degrees higher than the corresponding 

 paraffins. For Table of Olefins see under Hydrocarbon. 



Oleic Acid (o'-le-ik). See Acid. 



Oleiferous (o-le-if ' -er-us) [oleum, oil ; ferre, to bear]. 

 Producing oil. 



Olein (o'-le-in) [oleum, oil], C 57 H ]04 O s . One of the 

 most widely distributed of the natural fats ; the trioleic 

 ether of glyceryl. It is a colorless oil at ordinary 

 temperatures, with little odor and a faint sweetish 

 taste, insoluble in water, readily soluble in alcohol and 

 ether. 



Oleo- (o'-le-o-) [oleum, oil]. A prefix to denote con- 

 nection with or relation to an oil. 



Oleomargarin (o-le-o-mar' -gar-in) [oleum, oil ; fxap- 

 yapoc, the pearl oyster]. Butterin ; an artificial 

 butter made by removing the excess of stearin from 

 tallow or suet (or from lard in winter seasons), and 

 flavoring the residue with the natural flavoring-prin- 

 ciple of butter. The fat is melted at a temperature not 

 exceeding no° F. — otherwise the product becomes 

 granular and coarse — and in cooling, the excess of 

 stearin is separated by crystallization ; the remainder 

 is oleomargarin. When prepared from pure materials, 

 the artificial product is less liable to become rancid than 

 ordinary dairy butter, being free from the bacteria 

 frequently found in the latter. The following analysis 

 of oleomargarin is given by Dr. Bell : — 



Oleometer (o-le-om'-ct-er) [oleum, oil ; phpov, meas- 

 ure]. An instrument for ascertaining the weight and 

 purity of oil. 



Oleoresin (o-le-o-rez' '-in)[oleum, oil : resina, resin ; //., 

 OleoresinaT\. In pharmacy, a preparation consisting 



chiefly of a mixture of natural oils and resins extracted 



from vegetables by percolation with stronger ether. 



There are six official oleoresince. 

 Oleosaccharum (o-le-o-sak-ar' -urn) [oleum, oil ; aajc- 



Xapov, sugar: pi., Oleosa cchara~]. An oil-sugar; a 



preparation made by saturating thirty grains of sugar 



with one drop of volatile oil. 

 Oleose (o'-le ~oz) [oleosus, oily]. Oily. 

 Oleosity [p-le-os' -it-e) [oleosus, oily]. The property of 



being oily or fatty. 

 Oleous (o'-le-us) [oleosus, oily]. Oily; having the 



character of oil. 

 Olera (o-ler'-ah) [olus, a pot-herb]. In biology, the 



name given by early botanists to the kitchen-herbs. 

 Oleraceous (o-ler-a' -se-us) [olus, a pot-herb ; oleraceus, 



resembling herbs]. Esculent, as a pot-herb. 

 Oleum {o'-le-um) [L. : pi., Olea~\. See Oil. O. 



aethereum, ethereal oil, a volatile liquid consisting of 



equal volumes of heavy oil of wine, and ether. O. 



catharticum, oil of juniper. See Juniper. O. ceta- 



ceum, whale-oil. O. cinereum. See Gray Oil. 



O. fagi, the empyreumatic oil of beech, useful in 



various skin-diseases. Unof. O. phosphoratum. 



See Oil, Phosphorated, and Phosphorus. O. rusci, 



Russian oil ; the empyreumatic oil of birch, useful in 



various skin-diseases. Unof. O. terrae, rock-oil. 

 Olfaction {ol-fak'-shun) [olfacere, to smell]. The 



function of smelling. 

 Olfactive {ol-fak' -tiv) [olfacere, to smell]. Synonym 



of Olfactory. O. Angle, the angle formed by the line 



of the olfactory fossa and the os planum of the sphen- 

 oid bone. 

 Olfactometer (olfak-tom' '-et-er)[olJ 'actus, smell ; ptrpnv, 



measure]. An instrument for measuring the power 



of smell in any given case. 

 Olfactor {ol-fak' -tor) [olfacere, to smell]. A unit of 



olfactory sensibility. 

 Olfactory (ol-fah'-to-re) [olfacere, to smell]. Pertaining 



to the sense or organ of smell. O. Angle. See Olf 



Angle. O. Bulb. See Bulb. O. Cells. The cells of the 



nasal fossse forming the peripheral end-organs of the 



olfactory apparatus. O. Center, the cerebral center that 



appreciates smell, supposed by 



Munk to be in the hippocampal 



gyrus. O. Cleft, a slit between 



the tip of the middle turbinated 



bone and the nasal septum. O. 



Clubs, the clavilla; marginales, 



or condyli marginales of medusse. 



O. Foramina. See Foramina, 



Table of. O. Fossa. See 

 Fossa. O. Ganglion, the olfac- 

 tory bulb. O. Glomeruli. See 



Glomerulus. O. Groove. See 



O. Sulcus. O. Lobe, the olfac- 

 tory tubercle, tract, bulb, and 

 roots, considered as a whole. O. 

 Membrane, the mucous mem- 

 brane of the nose. O. Nerve 

 (Stirling). See Nerves, Tabic of. 

 0. Pit, the primitive ectodermal 

 invagination to become the nasal 

 cavity. O. Plate, one of the 

 two areas of thickened ecto- 

 derm immediately above the primi- 

 tive oral cavil v, and in contact 

 with the wall of the fore-brain ; it 

 is the earliest indication of the 

 nasal mucous membrane. O. Region, tin- an. 1 

 tribution of tin- olfactory nerve. O. Roots, the n 

 connecting the olfactory tract with the cerebral hemi- 

 spheres. O. Sulcus, the furrow for the olfactory tnict 



Olfactory Cells. 



n. From human be- 

 ing, n. From Irog. 

 K. Suppoitii 



