One skilled in ophthalmology; an oculist.

The science which treats of the structure, functions, and diseases of the eye.

An instrument devised by Helmholtz for measuring the size of a reflected image on the convex surface of the cornea and lens of the eye, by which their curvature can be ascertained.

An instrument for viewing the interior of the eye, particularly the retina. Light is thrown into the eye by a mirror (usually concave) and the interior is then examined with or without the aid of a lens.

A branch of physiognomy which deduces the knowledge of a person's temper and character from the appearance of the eyes.

Same as Ophthalmia.

Of, pertaining to, or designating, an organic acid obtained by the oxidation of narcotine.

An alkaloid (C22H23NO7) found in small quantity in opium. It is identical with narcotine. It is present in amounts up to 11% in Papaver somniferum, and is used clinically as an antitussive.

Same as Meconin.

To subject to the influence of an opiate; to put to sleep.

Mixed with opiates.

Opium.

Bringing help.

Workmanship.

An artificer; a workman.

Capable of being opined or thought.

The act of thinking; a supposition.

Obstinate in holding opinions; opinionated.

One fond of his own opinions; one who holds an opinion.

To have an opinion; to judge; to think; to suppose.

One who opines.

See Opiniaster. [Obs.].

To hold or maintain persistently.

Opinionated.

Opinionative.

See Opiniaster.

Opinionated.

One who is opinionated.

Obstinacy in opinions.

An imaginary animal borne as a charge, having wings, an eagle's head, and a short tail; -- sometimes represented without wings.

Opinion.

To opine.

Being, or capable of being, a matter of opinion; that can be thought; not positively settled; as, an opinionable doctrine.

Opinionated.

Stiff in opinion; firmly or unduly adhering to one's own opinion or to preconceived notions; obstinate in opinion.

Conceitedly.

An opinionist.

Unduly attached to one's own opinions; opinionated.

An opinionated person; one given to conjecture.

Opinionated; conceited.

One fond of his own notions, or unduly attached to his own opinions.

Sumptuous.

An instrument with a revolving wheel for measuring a curved line, as on a map.

The middle of the posterior, or dorsal, margin of the great foramen of the skull.

A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.

Of or pertaining to the Opisthobranchiata. One of the Opisthobranchiata.

Concave behind; -- applied especially to vertebrae in which the anterior end of the centrum is convex and the posterior concave.

A back chamber; especially, that part of the naos, or cella, farthest from the main entrance, sometimes having an entrance of its own, and often used as a treasury.

A division of serpents which have some of the posterior maxillary teeth grooved for fangs.

A writing upon the back of anything, as upon the back of a leaf or sheet already written upon on one side.

An order of eellike fishes having the scapular arch attached to the vertebrae, but not connected with the skull.

Having the pulmonary sac situated posteriorly; -- said of certain air-breathing Mollusca.

The inferior and posterior of the three elements forming the periotic bone.

A tetanic spasm in which the body is bent backwards and stiffened.

The act of helping or aiding; help.

The inspissated juice of the Papaver somniferum, or white poppy.

The old name of the aromatic resinous juice of the Balsamodendron opobalsamum, now commonly called balm of Gilead. See under Balm.

A kind of plaster, said to have been invented by Mindererus, -- used for external injuries.

See Army organization, above.

The inspissated juice of an umbelliferous plant (the Opoponax Chironum), brought from Turkey and the East Indies in loose granules, or sometimes in larger masses, of a reddish yellow color, with specks of white. It has a strong smell and acrid taste, and was formerly used in medicine as an emmenagogue and antispasmodic.

An older division of the suborder Ophidia of serpents; it includes those snakes in which the mouth is not dilatable.

An inhabitant of a town.

To pledge; to pawn.

To crowd together; to fill with obstructions; to block up.

The act of filling or crowding together; a stopping by redundant matter; obstruction, particularly in the lower intestines.

Obstructive.

Filled; crowded.

The act of filling up, or the state of being filled up; fullness.

To oppose.

The act of opening an academical disputation; the proposition of objections to a tenet, as an exercise for a degree.

One who opposes; an adversary; an antagonist; a foe.

To suit.

The art or practice of taking advantage of opportunities or circumstances, or of seeking immediate advantage with little regard for ultimate consequences.

One who advocates or practices opportunism.

taking immediate advantage, often unethically, of any circumstance of possible benefit; practising opportunism.

Fit or convenient time or situation; a time or place permitting or favorable for the execution of a purpose; a suitable combination of conditions; suitable occasion; chance.

The condition or quality of being opposable.

Capable of being opposed or resisted.

Opposition.

To be set opposite.

Not to be effectually opposed; irresistible.

One who opposes; an opponent; an antagonist; an adversary.

characterized by active opposition; as, two bitterly opposing schools of thought.

Placed over against; standing or situated over against or in front; facing; -- often with to; as, a house opposite to the Exchange; the concert hall and the state theater stood opposite each other on the plaza.

One who opposes; an opponent; an antagonist.

In a situation to face each other; in an opposite manner or direction; adversely.

The quality or state of being opposite.

Placed at the same node with a leaf, but separated from it by the whole diameter of the stem; as, an oppositifolious peduncle.

The act of opposing; an attempt to check, restrain, or defeat; resistance.

One who belongs to the opposition party.

Placed in front of a petal.

Placed in front of a sepal.

Capable of being put in opposition.

To impose excessive burdens upon; to overload; hence, to treat with unjust rigor or with cruelty.

having excessive or unfair burdens imposed.

The act of oppressing, or state of being oppressed.

Unreasonably burdensome; unjustly severe, rigorous, or harsh; as, oppressive taxes; oppressive exactions of service; an oppressive game law.

One who oppresses; one who imposes unjust burdens on others; one who harasses others with unjust laws or unreasonable severity.

Oppression.

Expressive of opprobrium; attaching disgrace; reproachful; scurrilous; as, opprobrious language.

A state of disgrace; infamy; reproach mingled with contempt; odium{3}.

Opprobrium.

To fight against; to attack; to be in conflict with; to oppose; to resist.

The act of oppugning; opposition; resistance.

Tending to awaken hostility; hostile; opposing; warring. An opponent.

Opposition.

One who opposes or attacks; that which opposes.

Education late in life.

An instrument for measuring the limits of distinct vision in different individuals, and thus determiming the proper focal length of a lens for correcting imperfect sight.

A catering; a buying of provisions.

That may be chosen; desirable.

To choose; to wish for; to desire.

The act of optating; a wish.

Something to be desired.

In an optative manner; with the expression of desire.

The organ of sight; an eye.

the ability of a chemical compound to rotate the plane of plane-polarized light. This is found only in chemicals whose molecular structure does not have a plane of symmetry, and is common in biochemical compounds.

a cable containing multiple optical fibers.

A thin fiber of very pure glass used to carry signals transmitted by means of light. It has much greater information-carrying capacity than a copper wire, and in the 1990's became a dominant means of transmitting telephone communications over long distances.

Of, pertaining to, or using vision or sight; as, optical illusions.