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Ongoing

The act of going forward; progress; (pl.) affairs; business; current events.

ongoing

Occurring at present; progressing; in progress; continuing; not past, completed, or future; as, an ongoing petition drive; an ongoing effort.

Onion

A liliaceous plant of the genus Allium (Allium cepa), having a strong-flavored bulb and long hollow leaves; also, its bulbous root, much used as an article of food. The name is often extended to other species of the genus.

onion dome

A dome with a pointed top, its width often extending beyond the width of the tower it covers; -- a style of architecture characteristic of Russian Orthodox churches.

onionskin

A kind of thin but strong translucent paper with a glossy finish.

Oniscus

The type genus of the Oniscidae, consisting of woodlice that cannot roll into a ball.

Only

Save or except (that); -- an adversative used elliptically with or without that, and properly introducing a single fact or consideration.

Onocerin

A white crystalline waxy substance extracted from the root of the leguminous plant Ononis spinosa.

Onoclea

A genus consisting of only species: the sensitive fern; in some classifications it is included in the Polypodiaceae.

onomancy

Divination by the letters of a name; nomancy.

Onomastic

Applied to a signature when the body of the instrument is in another's handwriting.

Onomasticon

A collection of names and terms; a dictionary; specif., a collection of Greek names, with explanatory notes, made by Julius Pollux about a. d. 180.

Onomatology

The science of names or of their classification.

Onomatope

An imitative word; an onomatopoetic word.

Onomatopoeia

The formation of words in imitation of sounds; a figure of speech in which the sound of a word is imitative of the sound of the thing which the word represents; as, the buzz of bees; the hiss of a goose; the crackle of fire.

Onomatopoetic

Of or pertaining to onomatopoeia; characterized by onomatopoeia; imitative; as, an onomatopoetic writer or word.

Onondagas

A tribe of Indians formerly inhabiting what is now a part of the State of New York. They were the central or head tribe of the Five Nations.

Onset

To assault; to set upon.

onshore

coming from the sea toward the land; -- of winds and weather; as, an onshore gale. Opposed to offshore.

onside

Not offside; being within the prescribed area of play.

Onslaught

An attack; an onset; esp., a furious or murderous attack or assault.

Onstead

A single farmhouse; a steading.

Onto

On the top of; upon; on. See On to, under On, prep.

Ontogenetic

Of or pertaining to ontogenesis; as, ontogenetic phenomena.

Ontogeny Ontogenesis

The history of the individual development of an organism; the sequence of events involved in the development of an organism; the history of the evolution of the germ; the development of an individual organism, -- in distinction from phylogeny, or evolution of the tribe. Called also henogenesis, henogeny.

Ontologist

One who is versed in or treats of ontology.

Ontology

That department of the science of metaphysics which investigates and explains the nature and essential properties and relations of all beings, as such, or the principles and causes of being.

Onus

A burden; an obligation.

Onward

Toward a point before or in front; forward; progressively; as, to move onward.

Onychia

A whitlow. An affection of a finger or toe, attended with ulceration at the base of the nail, and terminating in the destruction of the nail.

onychophoran

Any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms; a member of the Onychophora, also called Malacopoda. See Malacopoda.

onymous

bearing a name; as, articles in magazines are usually onymous. Opposite of anonymous.

Onyx

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

Deep, jet-black.

oo

Any of several beautiful birds of the genus Moho, including the extinct Moho nobilis. They are honey-eaters native to the Hawaiian Islands. It yields the brilliant yellow feathers formerly used in making the royal robes. Called also yellow-tufted honeysucker.

Ooecium

One of the special zooids, or cells, of Bryozoa, destined to receive and develop ova; an ovicell. See Bryozoa.

Oogenesis

The development, or mode of origin, of the ova.

Oogonium

A special cell in certain cryptogamous plants containing oospheres, as in the rockweeds (Fucus), and the orders Vaucherieae and Peronosporeae.

Oolite

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.

Oolitic

Of or pertaining to oolite; composed of, or resembling, oolite.

Oology

The science of eggs in relation to their coloring, size, shape, and number.

Oolong

A fragrant variety of black tea having somewhat the flavor of green tea.

Oop

To bind with a thread or cord; to join; to unite.

Oophore

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 oophore is a minute prothallus; in mosses it is the leafy plant.

Oophoric

Having the nature of, or belonging to, an oophore.

Oophoridium

The macrosporangium or case for the larger kind of spores in heterosporous flowerless plants.

Oophyte

Any plant of a proposed class or grand division (collectively termed oophytes or Oophyta), which have their sexual reproduction accomplished by motile antherozoids acting on oospheres, either while included in their oogonia or after exclusion.

Oorial

A wild, bearded sheep inhabiting the Ladakh mountains. It is reddish brown, with a dark beard from the chin to the chest.

Oosperm

The ovum, after fusion with the spermatozoon in impregnation.

Oosporangium

An oogonium; also, a case containing oval or rounded spores of some other kind than oospores.

Oospore

A special kind of spore resulting from the fertilization of an oosphere by antherozoids. A fertilized oosphere in the ovule of a flowering plant.

Oostegite

One of the plates which in some Crustacea inclose a cavity wherein the eggs are hatched.

Ootheca

An egg case, especially those of many kinds of mollusks, and of some insects, as the cockroach. Cf. Ooecium.

Ootocoid Ooticoid

A half oviparous, or an oviparous, mammal; a marsupial or monotreme.

Ootype

The part of the oviduct of certain trematode worms in which the ova are completed and furnished with a shell.

Ooze

To cause to ooze.

Oozy

Miry; containing soft mud; resembling ooze; as, the oozy bed of a river.

Opacity

The state of being opaque; the quality of a body which renders it impervious to the rays of light; want of transparency; opaqueness.

Opah

A large oceanic fish (Lampris guttatus), inhabiting the Atlantic Ocean. It is remarkable for its brilliant colors, which are red, green, and blue, with tints of purple and gold, covered with round silvery spots. Called also king of the herrings.

Opal

A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.

Opalesce

To give forth a play of colors, like the opal.

Opalescence

A reflection of a milky or pearly light from the interior of a mineral, as in the moonstone; the state or quality of being opalescent.

Opalescent

Reflecting a milky or pearly light from the interior; having an opaline play of colors.

Opaline

An opaline variety of yellow chalcedony.

Opalize

To convert into opal, or a substance like opal.

Opaque

That which is opaque; opacity.

Opaqueness

The state or quality of being impervious to light; opacity.

Opeidoscope

An instrument, consisting of a tube having one end open and the other end covered with a thin flexible membrance to the center of which is attached a small mirror. It is used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds produced at the open end of the tube, as by speaking or singing into it.

Opelet

A bright-colored European actinian (Anemonia sulcata, syn. Anthea sulcata); -- so called because it does not retract its tentacles.

Open

To unclose; to form a hole, breach, or gap; to be unclosed; to be parted.

Open-air

Taking place in the open air; outdoor; as, an open-air game or meeting.

open-chain

not cyclic; having no rings of atoms within the molecular structure; having an open chain structure. Opposite of cyclic.

open-collared

not buttoned at the neck; -- of a shirt; as, dressed casually in shorts and an open-collared shirt.

open-ended

allowing for a spontaneous response; as, an open-ended question. Contrasted to multiple-choice.

Open-eyed

With eyes widely open; alert to possible danger; watchful; vigilant.

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