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ODOSIAL'OICS. Medicines for the relief 

 of odontalgy, or toothache. The best is 

 creosote. 



ODON'TOID, from odovf, a tooth, and 

 Ses, like. Toothlike, dentate. 



ODOSTOI/OGY, from above, a tooth, and 

 Xoyo?, discourse. The science of the 

 teeth ; their anatomy and functions. 



O'DOUR, Lat. odor, smell. This, which 

 is the emanation of an odoriferous body, 

 is generally ascribed to a portion of the 

 body itself converted into vapour: but, 

 from some experiments of M. Ilobiquet, 

 it would seem probable, that in many 

 cases the odour is owing not to the sub- 

 tance itself, but to a gas or vapour re- 

 sulting from its combination with an 

 appropriate vehicle, capable of diffusion 

 in space. 



(Ecoji'oMT, etes, house, V.IMI, I distri- 

 bute. In architecture, the proper laying 

 out of a building into separate apartments. 

 (ECUMEN'ICAL, oixovwvizo;. General, 

 as respects the whole inhabited world. 



CEcts. In ancient architecture, an 

 apartment adjoining a dining-room. 



CEnrMA. from otdta, to swell. A tu- 

 mour : restricted now to a minor degree 

 of anasarca. 



(EDE'MAToiD.fromofS-/)^, oedema, and 

 tioos, like. Like to an oedema. 



(EDEMOSAR'CA, from adrift*, oedema, 

 and <ra$%, flesh. A tumour of a nature 

 between the cedema and sarcoma. 



(ENAN'THE. Water Drop- wort. Agenus 

 of perennial plants. PentandriaItigynia. 

 Name from oivos, wine, and et6es, 

 a flower, because the flowers smell like 

 the vine. There are four British species 

 of this plant, of which the most known is 

 the hemlock dropwort, an actively poi- 

 sonous plant, which has often proved 

 fatal, being eaten by mistake instead of 

 water-parsnip. It is the most deleterious 

 of all the plants produced by this country 

 CEN'OMANCT, from oivof, wine, am 

 UM-vmot,, prophecy. A Grecian mode of 

 divination, by pouring out wine in liba- 

 tion, and observing its colour, sound, &c. 

 CESOPHAGOT'OMY, from oiyoQafyos , the 

 gullet, and -nu.vta, to cut. The operation 

 of cutting into the gullet, to extract a 

 foreign body. 



(ESOPH'AGUS, otffoQayo;. The gullet, 

 from oitrca,to carry, and Qotyu, to eat ; be- 

 cause it carries the food into the sto 

 mach. It extends between the pharynx 

 and the upper orifice of the stomach. 



OEs'TRts. The Gad-bee. A genus o 

 dipterous insects, of the athericerous fa 

 mily. The cestri resemble large and 

 densely pilose flies, and their hairs are 

 frequently coloured in *>ands, like those 



)f the Bombi. They deposit their eggs 

 >n the body of various herbivorous quad- 

 rupeds, each species being usually a pa- 

 rasite of one particular species of mam- 

 miferous animal. The ox, horse, ass, 

 rein-deer, stag, antelope, camel, sheep, 

 and hare, are all subject to be inhabited 

 by the larvae of cestri, and all exhibit an 

 extraordinary dread of the insect, when 

 t is buzzing about them for the purpose 

 of depositing its eggs. The species are 

 named from the animals they infest. 



OF'FERTOR?, Lat. offertorium. Prima- 

 rily, an anthem chanted, or a voluntary 

 played on the organ, during the offering, 

 ind a part of the mass in the Catholic 

 church : but since the reformation it de- 

 notes certain sentences in the communion- 

 office, read while the alms are being col- 

 lected. 



OF'FICE. 1. Some particular charge or 

 trust, or dignity attended with a public 

 function. Thus we speak of the office of 

 secretary of state, of treasurer, of a judge, 

 of a sheriff, of a justice of the peace, &c. 

 "We also describe offices as civil, judicial 

 ministerial, executive, legislative, politi- 

 cal, municipal, diplomatic, military, ec- 

 clesiastical, &c. 2. A place or apart- 

 ment appointed for the discharge of any 

 particular duty or employment. The term 

 is also used generally in the plural, offices, 

 for subordinate buildings belonging to a 

 farm. 



OF'FICER. A person authorized to per- 

 form some public duty. Officers are civil, 

 military, and ecclesiastical. The great 

 officers of state are the lord high steward, 

 the lord high chancellor, the lord high 

 treasurer, the lord president of the coun- 

 cil, the lord privy-seal, the lord chamber- 

 lain, the lord high constable, and the earl- 

 marshal, with numerous subordinate offi- 

 cers. In the army there are general officers ; 

 as generals, lieutenant-generals, major- 

 generals, and brigadiers. Staff-officers are 

 such as belong to the general staff, as quar- 

 ter-master-generals, adjutant-generals, 

 aides-de-camps. Commissioned-officers are 

 such as hold their appointments by a com- 

 mission from the Crown; non-commis- 

 sioned-officers are sergeant-majors, quarter- 

 master-sergeants, &c. , down to flfe-majors, 

 appointed by the superior officers of the 

 regiments. Brevet-officers are such as 

 hold a higher rank than they receive pay 

 for. Subaltern-officers are all below the 

 rank of captain. In the navy, the com- 

 missioned officers hold their commissions 

 from the lords of the admiralty. Flag- 

 officers are admirals, who hoist flags at the 

 mast-head. See ADMIRAL. The petty-officers 

 are appointed by the captains of ships. 



OFFI'CIAL. 1. Relating to an office. 

 2. An ecclesiastical judge appointed by 

 the bishop, chapter, archdeacon, &c., 

 with charge of the spiritual juiisdiction. 



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