| Words | Parts of Speech | Meaning/Definition/Similar Words |
|---|---|---|
| opacular | adjective | Opaque. |
| opalesce | verb i. | To give forth a play of colors, like the opal. |
| opalized | imp. & past participle | of Opalize |
| open-air | adjective | Taking place in the open air; outdoor; as, an open-air game or meeting. |
| openbill | noun | A bird of the genus Anastomus, allied to the stork; — so called because the two parts of the bill touch only at the base and tip. One species inhabits India, another Africa. Called also open-beak. See Illust. (m), under Beak. |
| openness | noun | The quality or state of being open. |
| openwork | noun | Anything so constructed or manufactured (in needlework, carpentry, metal work, etc.) as to show openings through its substance; work that is perforated or pierced., A quarry; an open cut. |
| operable | adjective | Practicable. |
| operance | noun | Alt. of Operancy |
| operancy | noun | The act of operating or working; operation. |
| operated | imp. & past participle | of Operate |
| operatic | adjective | Alt. of Operatical |
| operator | noun | One who, or that which, operates or produces an effect., One who performs some act upon the human body by means of the hand, or with instruments., A dealer in stocks or any commodity for speculative purposes; a speculator., The symbol that expresses the operation to be performed; — called also facient. |
| opercula | noun pl. | See Operculum., of Operculum |
| operetta | noun | A short, light, musical drama. |
| ophidian | noun | One of the Ophidia; a snake or serpent., Of or pertaining to the Ophidia; belonging to serpents. |
| ophidion | noun | The typical genus of ophidioid fishes. [Written also Ophidium.] See Illust. under Ophidioid. |
| ophiuran | adjective | Of or pertaining to the Ophiurioidea., One of the Ophiurioidea. |
| ophiurid | noun | Same as Ophiurioid. |
| opianine | noun | An alkaloid found in small quantity in opium. It is identical with narcotine. |
| opificer | noun | An artificer; a workman. |
| opinable | adjective | Capable of being opined or thought. |
| opinator | noun | One fond of his own opinious; one who holds an opinion. |
| opinlate | verb t. | To hold or maintain persistently. |
| opinicus | noun | An imaginary animal borne as a charge, having wings, an eagle’s head, and a short tail; — sometimes represented without wings. |
| opopanax | noun | 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. |
| oppilate | verb t. | To crowd together; to fill with obstructions; to block up. |
| oppleted | adjective | Filled; crowded. |
| opponent | adjective | Situated in front; opposite; hence, opposing; adverse; antagonistic., One who opposes; an adversary; an antagonist; a foe., One who opposes in a disputation, argument, or other verbal controversy; specifically, one who attacks some theirs or proposition, in distinction from the respondent, or defendant, who maintains it. |
| opposing | present participle & vb. noun | of Oppose |
| opposite | adjective | Placed over against; standing or situated over against or in front; facing; — often with to; as, a house opposite to the Exchange., Applied to the other of two things which are entirely different; other; as, the opposite sex; the opposite extreme., Extremely different; inconsistent; contrary; repugnant; antagonistic., Set over against each other, but separated by the whole diameter of the stem, as two leaves at the same node., Placed directly in front of another part or organ, as a stamen which stands before a petal., One who opposes; an opponent; an antagonist., That which is opposed or contrary; as, sweetness and its opposite. |
| opprobry | noun | Opprobrium. |
| oppugned | imp. & past participle | of Oppugn |
| oppugner | noun | One who opposes or attacks; that which opposes. |
| optation | noun | The act of optating; a wish. |
| optative | adjective | Expressing desire or wish., Something to be desired., The optative mood; also, a verb in the optative mood. |
| optician | adjective | One skilled in optics., One who deals in optical glasses and instruments. |
| optimacy | noun | Government by the nobility., Collectively, the nobility. |
| optimate | adjective | Of or pertaining to the nobility or aristocracy., A nobleman or aristocrat; a chief man in a state or city. |
| optimism | noun | The opinion or doctrine that everything in nature, being the work of God, is ordered for the best, or that the ordering of things in the universe is such as to produce the highest good., A disposition to take the most hopeful view; — opposed to pessimism. |
| optimist | noun | One who holds the opinion that all events are ordered for the best., One who looks on the bright side of things, or takes hopeful views; — opposed to pessimist. |
| optimity | noun | The state of being best. |
| optional | adjective | Involving an option; depending on the exercise of an option; left to one’s discretion or choice; not compulsory; as, optional studies; it is optional with you to go or stay., See Elective, n. |
| optogram | noun | An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See Optography. |
| opulence | noun | Wealth; riches; affluence. |
| opulency | noun | See Opulence. |
| opuscule | noun | A small or petty work. |
| opuscula | plural | of Opusculum |