| Words | Parts of Speech | Meaning/Definition/Similar Words |
|---|---|---|
| opaque | adjective | Impervious to the rays of light; not transparent; as, an opaque substance., Obscure; not clear; unintelligible., That which is opaque; opacity. |
| opelet | noun | A bright-colored European actinian (Anemonia, / Anthea, sulcata); — so called because it does not retract its tentacles. |
| opened | imp. & past participle | of Open |
| opener | noun | One who, or that which, opens. |
| openly | adverb | In an open manner; publicly; not in private; without secrecy., Without reserve or disguise; plainly; evidently. |
| ophite | adjective | Of or pertaining to a serpent., A greenish spotted porphyry, being a diabase whose pyroxene has been altered to uralite; — first found in the Pyreness. So called from the colored spots which give it a mottled appearance., A mamber of a Gnostic serpent-worshiping sect of the second century. |
| opiate | noun | Originally, a medicine of a thicker consistence than sirup, prepared with opium., Any medicine that contains opium, and has the quality of inducing sleep or repose; a narcotic., Anything which induces rest or inaction; that which quiets uneasiness., Inducing sleep; somniferous; narcotic; hence, anodyne; causing rest, dullness, or inaction; as, the opiate rod of Hermes., To subject to the influence of an opiate; to put to sleep. |
| opined | imp. & past participle | of Opine |
| opiner | noun | One who opines. |
| oppone | verb t. | To oppose. |
| oppose | noun | To place in front of, or over against; to set opposite; to exhibit., To put in opposition, with a view to counterbalance or countervail; to set against; to offer antagonistically., To resist or antagonize by physical means, or by arguments, etc.; to contend against; to confront; to resist; to withstand; as, to oppose the king in battle; to oppose a bill in Congress., To compete with; to strive against; as, to oppose a rival for a prize., To be set opposite., To act adversely or in opposition; — with against or to; as, a servant opposed against the act., To make objection or opposition in controversy. |
| oppugn | verb t. | To fight against; to attack; to be in conflict with; to oppose; to resist. |
| optate | verb i. | To choose; to wish for; to desire. |
| optics | noun | That branch of physical science which treats of the nature and properties of light, the laws of its modification by opaque and transparent bodies, and the phenomena of vision. |
| optime | noun | One of those who stand in the second rank of honors, immediately after the wranglers, in the University of Cambridge, England. They are divided into senior and junior optimes. |
| option | noun | The power of choosing; the right of choice or election; an alternative., The exercise of the power of choice; choice., A wishing; a wish., A right formerly belonging to an archbishop to select any one dignity or benefice in the gift of a suffragan bishop consecrated or confirmed by him, for bestowal by himself when next vacant; — annulled by Parliament in 1845., A stipulated privilege, given to a party in a time contract, of demanding its fulfillment on any day within a specified limit. |