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on-site

Taking place or located at the indicated site; as, on-site inspection. Opposed to off-site.

on-street

at the sides of streets; as, on-street parking is prohibited at rush hour. Opposite of off-street.

Onager

A military engine acting like a sling, which threw stones from a bag or wooden bucket, and was operated by machinery.

onagon

A form of drum used by the Chippewa indians.

Onagra

Same as Oenothera, a genus of plants consisting of the evening primrose.

onagra

The female of the onager.

Onagrarieous Onagraceous

Pertaining to, or resembling, a natural order of plants (Onagraceae or Onagrarieae), which includes the fuchsia, the willow-herb (Epilobium), and the evening primrose (/nothera).

Onanism

Self-pollution; masturbation.

Onappo

A nocturnal South American monkey (Callithrix discolor), noted for its agility; -- called also ventriloquist monkey.

Once

For one time; by limitation to the number one; not twice nor any number of times more than one.

once-over

a swift cursory examination or inspection; as, I gave him the once-over.

onchocerciasis

An infection with nematodes of the genus Onchocerca, especially Onchocerca volvulus. Untreated, such infections can cause serious dermatological problems, and in advanced cases may lead to blindness. In certain areas of tropical Africa the blindness caused by onchocerciasis is called river blindness.

Onchorynchus

A genus of fishes including the sockeye salmon; chinook salmon; and coho salmon.

Oncidium

A genus of tropical orchidaceous plants, the flower of one species of which (Oncidium Papilio) resembles a butterfly.

Oncograph

An instrument for registering the changes observable with an oncometer.

Oncometer

An instrument for measuring the variations in size of the internal organs of the body, as the kidney, spleen, etc.

oncoming

the beginning or early stages; the onset.

Oncost

In cost accounting, expenditure which is involved in the process of manufacture or the performance of work and which cannot be charged directly to any particular article manufactured or work done (as where different kinds of goods are produced), but must be allocated so that each kind of goods or work shall bear its proper share.

oncotomy

The opening of an abscess, or the removal of a tumor, with a cutting instrument.

Ondatra

A genus of rodents including the muskrat (Ondatra zibethica).

onde

Hatred; fury; envy.

Ondograph

An instrument for autographically recording the wave forms of varying currents, esp. rapidly varying alternating currents.

Ondoyant

Wavy; having the surface marked by waves or slightly depressed furrows; as, ondoyant glass.

One

To cause to become one; to gather into a single whole; to unite; to assimilite.

one-dimensional

having only one dimension; as, a line is a one-dimensional object; a one-dimensional array.

one-eared

Relating to or having or hearing with only one ear; monaural. Opposite of binaural.

one-edged

Having only one sharp edge; single-edged; -- of cutting instruments, mostly swords and razor blades. Opposed to double-edged.

one-eyed

having or showing only one eye; as, one-eyed Jacks are wild; the three one-eyed Cyclopes of Greek myth.

one-half

one of two equal parts of a divisible whole; a half; a century and one half.

one-hitter

A game in which a pitcher allows the opposing team only one hit.

one-horse

Drawn by one horse; having but a single horse; as, a one-horse carriage.

One-sided

Having one side only, or one side prominent.

one-step

an early ballroom dance, precursor to the foxtrot.

one-third

one of three equal parts of a divisible whole.

one-up

Ahead of a friend or competitor in some competitive activity.

one-upmanship

The attitude or practice of trying to keep one step ahead of a friend or competitor; vigorous competitiveness.

one-way

Legally permitting movement or travel in one direction only; -- of paths, especially roads; as, one-way streets.

one-woman

Designed for or restricted to a single person; same as one-man, but used when the person in question is female, or to avoid sexist language; as, a one-woman submarine; a one-woman show.

one-year

completing its life cycle within a year.

Oneberry

The herb Paris. See Herb Paris, under Herb.

Oneidas

A tribe of Indians formerly inhabiting the region near Oneida Lake in the State of New York, and forming part of the Five Nations. Remnants of the tribe now live in New York, Canada, and Wisconsin.

Onement

The state of being at one or reconciled.

Oneness

The state of being one; singleness in number; individuality; unity.

Onerary

Fitted for, or carrying, a burden.

Oneself

A reflexive form of the indefinite pronoun one. Commonly written as two words, one's self.

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.

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