||O*nych"i*a (?), n. [NL. See Onyx.] (Med.) (a) A whitlow. (b) An
||affection of a finger or toe, attended with ulceration at the base of
||the nail, and terminating in the destruction of the nail.
On"y*cho*man`cy (?), n. [Gr. &?;, &?;, a finger nail + -mancy: cf. F.
onychomancie.] Divination by the nails.
||On`y*choph"o*ra (?), n. pl. [NL., from Gr. &?;, &?;, a claw + &?;.]
||(Zoöl.) Malacopoda.
O"nyx (?), n. [L., fr. Gr. &?; a claw, finger nail, a veined gem. See
Nail, and cf. Onycha.] (Min.) Chalcedony in parallel layers of
different shades of color. It is used for making cameos, the figure
being cut in one layer with the next as a ground.
Onyx marble, a banded variety of marble or calcium carbonate resembling
onyx. It is obtained from Mexico.
Oo, a. One. [Obs.] Chaucer.
||O"ö (?), n. [Hawaiian.] (Zoöl.) A beautiful bird (Moho nobilis) of
||the Hawaiian Islands. It yields the brilliant yellow feathers
||formerly used in making the royal robes. Called also yellow-tufted
||honeysucker.
||O*œ"ci*um (?), n.; pl. Oœcia (#). [NL., fr. Gr. w,'o`n an egg + &?; a
||house.] (Zoöl.) One of the special zooids, or cells, of Bryozoa,
||destined to receive and develop ova; an ovicell. See Bryozoa.
O`ö*gen"e*sis (?), n. [Gr. w,'o`n an egg + E. genesis.] (Physiol.) The
development, or mode of origin, of the ova.
||O`ö*go"ni*um (?), n.; pl. L. Oögonia (#), E. Oögoniums (#). [NL., fr.
||Gr. w,'o`n an egg + &?; offspring.] (Bot.) A special cell in certain
||cryptogamous plants containing oöspheres, as in the rockweeds
||(Fucus), and the orders Vaucherieæ and Peronosporeæ.
O*oi"dal (?), a. [Gr. &?;; w,'o`n an egg + &?; form.] (Biol.) Shaped
like an egg.
Ook (?), n. Oak. [Obs.] "A branched ook." Chaucer.
O"ö*lite (?), n. [Gr. w,'o`n an egg + -lite: cf.F. oölithe. So named
from its resemblance to the roe of fish.] (Geol.) A variety of
limestone, consisting of small round grains, resembling the roe of a
fish. It sometimes constitutes extensive beds, as in the European
Jurassic. See the Chart of Geology.
O`ö*lit"ic (?), a. [Cf.F. oölithique.] Of or pertaining to oölite;
composed of, or resembling, oölite.
O`ö*log"ic*al (?), a. (Zoöl.) Of or pertaining to oölogy.
O*öl"o*gist (?), n. One versed in oölogy.
O*öl"o*gy (?), n. [Gr. w,'o`n an egg + -logy.] The science of eggs in
relation to their coloring, size, shape, and number.
Oo"long (?), n. [Chinese, green dragon.] A fragrant variety of black
tea having somewhat the flavor of green tea. [Written also oulong.]
{ Oo"mi*ac, Oo"mi*ak} (?), n. A long, broad boat used by the Eskimos.
Oon (?), a. One. [Obs.] Chaucer.
Oones (?), adv. Once. [Obs.] Chaucer.
Oop (?), v. t. [Etymol. uncertain.] To bind with a thread or cord; to
join; to unite. [Scot.] Jamieson.
{ Oo"pack, Oo"pak} (?), n. [So named from a district in China.] A kind
of black tea.
O"ö*phore (?), n. [Gr. &?; egg- bearing; w,'o`n an egg + &?; to bear.]
(Bot.) An alternately produced form of certain cryptogamous plants, as
ferns, mosses, and the like, which bears antheridia and archegonia, and
so has sexual fructification, as contrasted with the sporophore, which
is nonsexual, but produces spores in countless number. In ferns the
oöphore is a minute prothallus; in mosses it is the leafy plant.
O`ö*pho*rec"to*my (?), n. [Gr. w,'o`n egg + &?; to bear + &?; a cutting
out.] (Surg.) Ovariotomy.
O`ö*phor"ic (?), a. (Bot.) Having the nature of, or belonging to, an
oöphore.
||O`ö*pho*rid"i*um (?), n.; pl. L. Oöphorida (#), E. Oöphoridiums (#).
||[NL., dim. fr. Gr. &?;. See Oöphore.] (Bot.) The macrosporangium or
||case for the larger kind of spores in heterosporous flowerless
||plants.
||O`ö*pho*ri"tis (?), n. [NL., fr. Gr. w,'o`n egg + fe`rein to bear + -
||itis.] (Med.) Ovaritis.
O"ö*phyte (?), n. [Gr. w,'o`n an egg + fyto`n a plant.] (Bot.) Any
plant of a proposed class or grand division (collectively termed
oöphytes or Oöphyta), which have their sexual reproduction accomplished
by motile antherozoids acting on oöspheres, either while included in
their oögonia or after exclusion.
This class was at first called Oösporeæ, and is made to include all
algæ and fungi which have this kind of reproduction, however they may
differ in all other respects, the contrasted classes of Thallophytes
being Protophytes, Zygophytes, and Carpophytes. The whole system has
its earnest advocates, but is rejected by many botanists. See
Carpophyte.
<! p. 1004 !>
O`ö*phyt"ic (?), a. (Bot.) Of or pertaining to an oöphyte.
O*ö"ri*al (?), n. (Zoöl.) A wild, bearded sheep inhabiting the Ladakh
mountains. It is reddish brown, with a dark beard from the chin to the
chest.
O"ö*sperm (omac/"*sprm), n. [Gr. &?; an egg + E. sperm.] (Biol.) The
ovum, after fusion with the spermatozoön in impregnation. Balfour.