| OPEIDOSCOPE | • opeidoscope n. An instrument, consisting of a tube with one end open and the other end covered with a thin flexible… • OPEIDOSCOPE n. an instrument for illustrating sound by means of light. |
| OPENABILITY | • openability n. The quality of being openable. • OPENABILITY n. the ability to be opened. |
| OPENHEARTED | • openhearted adj. Alternative form of open-hearted. • open-hearted adj. Frank and candidly straightforward. • open-hearted adj. Generous and kind. |
| OPENMOUTHED | • openmouthed adj. Alternative form of open-mouthed. • open-mouthed adj. (Obsolete) Talkative; eager to speak. • open-mouthed adj. With the mouth open. |
| OPERABILITY | • operability n. The extent to which a system or device is operable. • OPERABILITY n. the ability to be operated. |
| OPERAGOINGS | • OPERAGOING n. attending the opera. |
| OPERATIONAL | • operational adj. Of or relating to operations, especially military operations. • operational adj. Functioning and ready for use. • operational adj. Effective or operative. |
| OPERATISING | • operatising v. Present participle of operatise. • OPERATISE v. to turn a play etc. into an opera, also OPERATIZE. |
| OPERATIVELY | • operatively adv. In an operative manner. • OPERATIVE adv. having the power of operating or acting. |
| OPERATIVITY | • operativity n. Operativeness. • OPERATIVITY n. the state of being operative. |
| OPERATIZING | • operatizing v. Present participle of operatize. • OPERATIZE v. to turn a play etc. into an opera, also OPERATISE. |
| OPERCULATED | • operculated adj. Operculate. • OPERCULATED adj. relating to the operculum, also OPERCULATE. |
| OPERETTISTS | • operettists n. Plural of operettist. • OPERETTIST n. a composer of operettas. |
| OPEROSENESS | • operoseness n. (Archaic) The state of being operose; tedium. • OPEROSENESS n. the state of being operose. |
| OPEROSITIES | • OPEROSITY n. laboriousness. |