| OPENABLE | • openable adj. Capable of being opened. • OPENABLE adj. able to be opened. |
| OPENCAST | • opencast adj. (Chiefly Britain) Of or pertaining to strip mining, in which material is removed from a surface that has been exposed. • open-cast adj. Alternative form of opencast. • OPENCAST adj. excavated from an open air site. |
| OPENINGS | • openings n. Plural of opening. • OPENING n. a vacant space. |
| OPENNESS | • openness n. Accommodating attitude or opinion, as in receptivity to new ideas, behaviors, cultures, peoples, environments… • openness n. The degree to which a person, group, organization, institution, or society exhibits this liberal attitude or opinion. • openness n. Lack of secrecy; candour, transparency. |
| OPENSIDE | • openside n. (Rugby) The space on the side of the pitch with the larger distance between the breakdown/set piece and the touchline. • openside n. (Rugby union) Short for openside flanker. • open-side n. (Rugby) the portion of the field which is larger as measured from a scrum or breakdown to the touchline. |
| OPENWORK | • openwork n. Any of several forms of metalwork or needlework having decorative openings. • openwork n. (Mining) A quarry; an open cut. • open-work n. Alternative spelling of openwork. |
| OPERABLE | • operable adj. Able to be operated or used. • operable adj. Able to be put into operation; practicable. • operable adj. Able to be treated by surgery. |
| OPERABLY | • operably adv. (Medicine) Such that it allows an operation to take place. • OPERABLE adv. that can be operated. |
| OPERANDS | • operands n. Plural of operand. • OPERAND n. a quantity on which a mathematical or logical operation is (to be) performed. |
| OPERANTS | • operants n. Plural of operant. • OPERANT n. an operator. |
| OPERATED | • operated v. Simple past tense and past participle of operate. • operated adj. (In combination) operated by the means specified e.g. a battery-operated toy. • operated adj. Having undergone an operation. |
| OPERATES | • operates v. Third-person singular simple present indicative form of operate. • OPERATE v. to perform a function. |
| OPERATIC | • operatic adj. Of, related to, or typical of opera. • OPERATIC adj. relating to opera. |
| OPERATOR | • operator n. One who operates. • operator n. A telecommunications facilitator whose job is to establish temporary network connections. • operator n. (Mathematics) A function or other mapping that carries variables defined on a domain into another variable… |
| OPERCELE | • OPERCELE n. an anatomical part that serves as a lid or cover, also OPERCULE, OPERCULUM. |
| OPERCULA | • opercula n. Plural of operculum. • OPERCULUM n. (Latin) an anatomical part that serves as a lid or cover, also OPERCELE, OPERCULE. |
| OPERCULE | • opercule n. Alternative form of operculum. • OPERCULE n. an anatomical part that serves as a lid or cover, also OPERCELE, OPERCULUM. |
| OPERETTA | • operetta n. (Music) A lighter version of opera with a frivolous story and spoken dialogue. • OPERETTA n. (Italian) a light musical drama with dialogue. |