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O:VIERS, or Sto 0.:.11 "" • eity of Arto:s, in the Frcneh
Hetl'erland" t\\'e.1Iy miles fouth of D unl:irk, .0<1
eigh,e.n fouth·ca!l 01 .
-\N D S, a di"iGon of ,he pro"i!!ee of Gron:ngeo,
in ,he Uni, ed Provioees.
o.;llil l EN, a town oí ,he Un:,ed N e,herl.nds, in the
pro\ince of o.,'crylié:l. r"uatecl 00. ,he Ielro< V eeht,
r~\'enteen miles Ilorth ·ean of D cventer.
DMo.I'HAGl.-\, an ancien, Grcek feltival, in hono", of
¡hechus. furnamed o.moph.gos, i. e. eater of raw
fl elh. This felliv. 1 w.s obferved in the Ill.nner
v. :th rhe orher feP..iv.:¡ls of Bd.cchus. in whi"h they
counterf<ited métdnefs; Wh3t \Vas peculiar tO it, \Vas
that the wodhipers ufed l O eal the entrails of goats ,
r3\V ar.d bloody, in imitation of the god, \\'1.0 was fup.
pafé:d to do the fame ,hiog.
OMo.PLATE, in anatomy. See ASA TO,",., p 176.
OhIPHALo.·MESENTERIC, in anatom y. AII rre·
tures are wraped up in at leatluvo coats'or membranes ;
mofl of lh:m have a third, calkd all"nloides, or uri·
nary.
Sorne, 3'1 lhe dQg. cat, hare, &c. have a (ourth,
which has l \VO blood-vc:(fels, viz. a vein and an artery,
called omphalo-mefenterics, bee.ufe pafling . loog
the flring tO the navel, and terminating io the me·
f<ntery.
O NAND , one of the " ibes of the [roquois, or
Five Nations , fitlJated on the Jake Ontario, or Fren–
tcnae, in Nonh Amerita: thcy are aJlies of Great
Britain.
O NAl\ [A, or o.NANISM, terms whieh ' fome late em –
piries h"'e framed, tO de?ote the erime of felf-póllu .
tion, mentioned in feripture to have been praéliftd by
o. nan, and puaifhed in him with dealh.
O N EGA· LA x E. a Jake upw>rds of on hundred miles
long, and fony broad, fitua,ed in the empire of R uni,
betweeo 61° and 63° of north lat. and 35°
longitude.
ON EGLl A, a po" tawn of Italy, feventy miles fout h–
\Vefl of Genoa, fubjeét 10 the king of Sardioia: _E.
laag. 80 1,0', .nd north lat. 44° .
O NEIROciuTICA , the art of interpre,ing dreams, or
prediéling fmure events (rom dreams.
ONGAR. a market town of E/I'ex, ten miles \Vea of
Chelmsrord .
ONGLE' E, in heraldry, .n appellation given to the
taJons o r of . or bird., when borne of a dif–
ferent eolour (rom tbat of tbe body of lhe animal.
ONlo.N. S.. CE ' A.
ONISCUS, in 'Zoology, • ceous of infetls, belonging to
the order of aptera. !t has J 4 feel, brif\ly feeJ ers,
.nd ao ov.l body. There are 17 fpeeies
ONKo.To.il1Y. in furgery, the operatioo of opeoing a
tumour or abfeefs . See S URG" Y.
ONo.CLEA, in bOlany, a genus of the eryptogamia
fi liees claf. : the fruit confins of feveral globlllar eap–
{ules. with IÍve valves and one eeH, in which are fe–
veral fmall hairy feed ••
ONo.CRo.T ALUS , in ornithology. See PELICAHU •.
O)'lOMANCY, a branch of di.inal;on, whieh forctds
o p A
the cood 01' bad fortune of a In. n, from the I< tt~rs in
his name.
F .om mueh . the fame principIe the yOllng R ona"
tc\t:.fieo lhel r mlflr<. fies as often as lhel !: were Jc:lt<:r::. in
ll:ci r naml'S: hcnce Mardal fays,
Norvia 1_,<CJ",hiJ, p I /OH JlI.Jlina biba/ur.
ONo.ill!\To.Po.Elll, in gr>mOl.r anJ rhetorie, afigu"
where \Voros are: formcd tO rc(emble lhe found mado
by the: things fignified; as the buz of bees, the clck–
ling o( hms, &c.
o.NONJ.S, in , a genus of the diadelphia deean–
dria clafs. The calíx ha~ live fegments j tln: \'cxiJlum
is Hrij tcd ; and the pcd is fenile acd tccgid. T here
are 19 fpccics, thrce of chem natives of Britain, tJIZ.
the {pinoCa, orrdl-harrow; lhe arvcnfis, or corn rd t–
harrow. ilnd the repeos, or creeping reCt-harrow.
o.NOPo.RDUM, a genll' of the fyngeoelia poJ)'gamia
"'quali. clafs. The receptacle is n,ked, and ,he /Cales
of Ihrir ealix are n,.rp_poinlCd. There are four fpe–
ríes, neme of [hem natives of Britain.
ONTAH lo., or FRONT ENAC , a lace of N o"h Ameri–
ca : fi. uated in W. long. 79°, aod betweeo 410 anJ
430 1 . lar.
o.NTo.L See METAP HYSJ CS.
ONYX, in narural hinory, one of Ihe femipellueid gems,
\Vilh \'~riouny coJoured zones, but Done: red; being
coml e , d of erynal, d<baf. d by a fmalJ admixture of
canh; and m:uJe up e¡lheTof a oumber of flat piares,
or of a feries of CO;ltS fu rrounding a central nudeu"
and feparated from e>eh Other by veios of a differeot
colour, re.(embling zones or bel u.
"le have (our fpeei<s o( thi. gem. I. A bluifh
white onc:, with broad white zones . 2. A very pUTe
pnyx, wirh fnow·white vcins. 3. T he jafponyx, or
horny onyx, with Rreen 'Zones. 4 ' The browo onyx,
\Vith bluilh white z:ones.
O a kiln for drying hops af,er they are pieked
(rom Ihe a alks.
o.o.STERGo., the no"h divifionof Wea Friellaod, ooe
of the U nited Provioees.
OPACITY, in philofophy, a quality of bodies which
renders them impervious to the rays of light. See
Ol'T lCS.
OPAL, in natu..1 hiflory, a fpeeies of gems.
The opal is a gem of a peculiar kind, and has beca
efleemed by maoy in all ages of very great value;
though at prcfent it is of l(f5 value, in proportion tO in
fize, than any of Ihe finer gems. lt is fofrer thao any
oth.. of ,he 60e gems, and is dillicult to polifh to any
degree of oieelY. It is found of various fhapes aDd fi–
'Zes: its mofl f«quent bignefs is beJweeo that of a pea
and a horfe·beao; but it is found as fmall as the head of
a large pin, and has beeo feen of the fize of a large ",al·
rntH . 115 figu re is very various and unce'n aío, bUI it is
never found in a cryflalJiform or columnar.' llate; iu
mofl ufu.l fhape is an irregularly oblong one, convex a–
boveJ lIau ed al boltom, and dent~o wi,h various (jDuofi~
t¡es :u its (jdes. lt is often found tt.mong t~e 100fe earth
o( mountains, fometimes (lO the fhores of rivcrs, and
not " "froqucntl}' bedced in ,he eoarfer kiods ofjafper.
JI