GIBERS 



242 



ONOSMA 



=Olacads: trees and shrubs, with small frag- 

 rant flowers, belonging to Berberales. 



Olbers, (ol'berz). In moon, q.v. 



Oldhamia, (ol-da'mi-a). [Professor Oldham.] 

 A sea^weed or a sertularian zoophyte : known 

 only by fossil remains, found in Cambrian 

 rocks ; supposed a polyzoon : probably a 

 plant. 



01d-man=Lichen saxatilis. 



Old-man's beard=Clematis vitalba. 



Old red sandstone=Devonian, q.v. 



Olea, (ol'e-a). [Gk. elaia, olive.] Olive, &c.: 

 a plant the type of Oleacese, q. v., gives virgin- 

 oil. 0. Europcea=Olive. 



Oleaceae, (ol-e-a'se-e). [Olea, q.v.} = Olive- 

 worts: olive, ash, &c.: trees and shrubs, 

 with dichotomous branches, belonging to 

 Solan ales. 



Oleander, (o-le-an'der)=Nerium, q.v. 



Oleaster, (6-le-as'ter). [Gk. olea, olive; instar, 



3.]=W 



= Wild-olive: the type of Elaeag- 

 nacese, q.v. 



Oleasters, (o-le-as'terz). [Oleaster, q.v.]= 

 Elseagnaceae, q.v. 



Oleates, (6'le-ats). [Oleic, q.i:] Compounds 

 of Oleic acid with bases. 



Olecranon, (6-lek'ra-non). [Gk. oleine, elbow; 

 kranos, helmet.] A projection of the ulna 

 forming the elbow. 



Olefiant gas, (6-le'fi-ant). [L. oleum, oil ; facio, 

 I make.]=C 2 H 4 Elayl=Ethylene: a colour- 

 less, slightly odorous, inflammable gas, 

 may be liquefied by pressure; and, mixed 

 with chlorine, becomes an oil called Dutch 

 liquid. 



Olefines, (o'le-flnz). [Olefiant, q.v.] Olefiant 

 gas series: ethylene, metbylene, amylene, 

 tetrylene, methene, &c. 



Oleic acid, (o'le-ic). [L. oleum, oiI.]=CisH340o: 

 an oily substance found in all fata 



Oleic series of acids=C n H2n-2O2: including 

 acrylic, crotonic, and oleic acids, the last 

 being the type of the series. 



Olein, (o'le-in). [L. oleum, oil.]=C57H 10 4O 6 : 

 a colourless liquid; a constituent of fats and 

 oils. 0. of linseed oi=Linolein, &c. 



Oleo-resins. A group of balsams, including 

 Canada balsam, copaiba balsam, and Mecca 

 balsam. 



01evinite=Olivinite, q.v. 



Olfactory, (oJ-fac'to-ri). [L. olfacio, I smell.] 

 0. lobe: the shape of a life-preserver; small 

 in man; larger in the rabbit; very large in 

 the lamprey. 0. nerves: the nerves of smell, 

 the first pair of cerebral nerves, the ter- 

 minations of which are in the nasal cavi- 

 ties; really processes of the brain and not 

 nerves. 



Olibanum, (o-lib'a-num). \Libanos, the Greek 

 name.] = True frankincense : an aromatic 

 resin obtained from the tree Boswellia. cf. 

 Frankincense. 



Oligocene, (o-lig'o-sen). [Gk. oligos, few; 

 kainos, new.]=Lower Miocene. 



Oligochseta, (51-i-g5-ke'ta). [Gk. oligos, few: 

 chaite, bristle.] =Terricola=Earth and Water 

 worms: a division of Annelida; herma- 

 phrodite: have setae or bristles for locomo- 

 tion. 



Oligoclase, (o-lig'6-klaz). [Gk. oligos, few; 

 klasis, fracture. ]=Soda-lime felspar: a variety 

 of felspar, chiefly silicate of aluminum. 



Oligodon, (o-lig'o-dou). [Gk. oligos, few; 

 odous, tooth.] Spotted-adder: a snake. 



Olive, (ol'iv). [Oliva, the Latin name.] 1.= 

 Olea Europsea: a tree 

 the type of Oleacese. 

 2. A colour: a com- 

 pound of green and 

 purple. 



Olive -worts = Oleacese, 

 q.v. 



Olivine, (ol'i-vin). 

 [Olive, q.v.] A mine- 

 ral of the topaz group, 

 chiefly silicate of mag- 

 nesia and iron, crystall- 

 ising in rhombs, usually 

 green coloured, and 

 found in lava ; also Olive, 



called chrysolite; sometimes found in 

 meteorites. 



Olivinite, (o-liv'i-nit). [Olive, q.v.] One of 

 the copper group of minerals, chiefly arseniate 

 of copper. 



Olympiad, (o-lim'pi-ad). [Olympias, the 

 Greek name.] =4 years. 



Omalidce, (o-mal'i-de). A family of beetles 

 belonging to Brachelytra. 



Ombrometer, (om-brom'e-ter). [Gk. ombros, 

 rain; metron, measure.] A rain gauge. 



Omentum, (o-men'tum). [The Latin word.] 

 =Caul: a membrane connecting the stomach, 

 colon, <fec. 



Omnivorce, (om-niv'o-rC). [L. omnis, all ; voro, 

 I eat.] Giebel's term for bears, &c.; Owen's 

 term for animals such as the hog. 



Omphalea. (om'fa-le-a). [Omphalos, q.v.] A 

 plant belonging to Euphorbiaceae. 0. tri- 

 ?uZra=Cob-nut=Hog-nut of Jamaica. 



Omphalos, (om'fa-los). [Gk. omphalos, navel.] 

 =The navel: the trace of the attachment of 

 the umbilical cord. 



Onager, (ou'a-jer). (The Latin name.] The 

 wild ass=Asinus onager. 



Onagraceae; (on-a-gra'se-e). [Onager, q.v.]= 

 Onagrads=: Fuchsias: herbs and shrubs be- 

 longing to Myrtales, named from the leaves 

 resembling the ears of an ass. 



Onchophora, ( on - kof 'o - ra ). A division of 

 Ccelelmintha, q.v. 



Onchus, (on'kus). A marine shark-like fish 

 of a high order of development, known only 

 by fossil spines, found in Upper Silurian. 



Onion, (un'yun). [Oignon, the French word.] 

 =Allium: an herb belonging to Liliacese. 



Onobrychis, (on-ob'ri-kis)=:Saint-foin: an herb 

 belonging to Leguminacese. 0. sativa= 

 Holy-hay. 



Ononis, (on-5'nis). [The Greek name.] Rest- 

 harrow: an herb belonging to Leguniinacese. 

 0. arvensis=Vfild liquorice. 



Onopordon, (on-o-por'don). [The Greek name.] 

 =Cotton -thistle^ Scotch- thistle : an herb 

 belonging to Asteracese. 0. acanthium= 

 Wild artichoke. 



Onosma, (on-os'ma). [Gk. onos, ass ; osme, 

 smell.] A plant belonging to Boraginaceae. 



