Skip to content A B C D E F G H I J K L M N O P Q R S T U V W X Y Z openmouthedness The state of having the mouth open, especially in astonishment. openness Used other than figuratively or idiomatically: see open, -ness. Openshaw A suburb of the City of Manchester, Greater Manchester, England (OS grid ref SJ8897). openside The space on the side of the pitch with the larger distance between the breakdown/set piece and the touchline. opensider openside flanker openture Refraining from seeking a resolution or ending for an emotionally difficult experience. OpenType A file format, developed jointly by Microsoft Corporation and Adobe Inc., for storing computer fonts. openwash To market something as open (without proprietary licensing) when it does not meet all the criteria of openness. openwashing The act of claiming something is open (without proprietary licensing) when it does not meet all the criteria of openness. openwork Any of several forms of metalwork or needlework having decorative openings. opepe Synonym of bilinga (tropical hardwood) opephoroid Relating to or characteristic of diatoms of the genus Opephora. oper A network operator on IRC. opera A theatrical work, combining drama, music, song and sometimes dance; usually, one sung-through, based on classical music and seen as more artistic and formalized than other forms of musical theater. operability The extent to which a system or device is operable. operable Able to be operated or used. operably Such that it allows an operation to take place. operad A set of operations, each one having a fixed finite number of arguments and one output, which can be composed with others. operadic Of or pertaining to operads. operafication The act or process of operafying. operafy To make into an opera or into the style of an opera; to make operatic. operagoer Someone who attends an opera performance operagoing Attending opera performances. operalike Resembling or characteristic of opera. operalogue A simplified film version of an opera. operameter An instrument or machine for measuring work done, especially the number of rotations by a machine or wheel in manufacturing cloth. operance operation; workings (the act of operating or working) operancy The quality of being operative. operand A quantity to which an operator is applied (in 3-x, the operands of the subtraction operator are 3 and x). operandum A lever, key or device installed in an operant chamber, upon which the "subject" exerts its responses. Sometimes referred to as a manipulandum. In the prototypical operant conditioning experiment, a rat (the subject) presses upon a lever (the operandum) which triggers the delivery of food (the reward or reinforcer). operant That operates to produce an effect. operantly In an operant manner operaphile One who enthusiastically enjoys opera. operaphobe A person who hates opera. operate To perform a work or labour; to exert power or strength, physical or mechanical; to act. operated Operated by the means specified e.g. a battery-operated toy. operatee Someone who has an operation. operatic Of, related to, or typical of opera. operatically In an operatic manner. operatics exaggerated or overly emotional behaviour; histrionics operating In operation; that operates. operation The method by which a device performs its function. operational Of or relating to operations, especially military operations. operationalism A philosophy that attempts to define all scientific concepts in terms of specified operations or procedures of observation and measurement. operationalist A proponent of operationalism. operationalistic Of or pertaining to operationalism. operationality The characteristic of being operational. operationalizability The state or characteristic of being capable of being operationalized. operationalizable Possible to operationalize; subject to operationalization. operationalization The act or process of operationalizing. operationalize To make operational. operationally In an operational manner; in accordance with an operation. operationism The doctrine that the meaning of a term consists of the operation(s) performed in defining it operationist A proponent of operationism. operationistic Of or relating to operationism. operations Any practically minded combination of business administration, management science, operations research, systems engineering, and industrial engineering. operatist A composer of opera. operative Effectual or important. operatively In an operative manner. operativeness The state or quality of being operative. operativity operativeness operatize To convert into operatic form. operator A person or organisation that operates a device, system, service, etc. operatorial Of or pertaining to an operator operatorless Without an operator (person who operates); fully automatic. operatorship The office of an operator operatory effective; practical; operative operatress A female operator. operatrix A female operator. opercle An operculum. opercled Having an opercle. opercular relating to the operculum opercularization The formation and development of the operculum opercularly In opercular fashion. operculate Having an operculum. operculated operculate operculation The condition of being operculate operculectomy The surgical procedure of removing the operculum. operculiferous Bearing an operculum. operculiform Having the form of a lid or cover. operculigenous Producing an operculum. operculigerous Having an operculum. operculitis Inflammation (pericoronitis) of the operculum. operculoinsular opercular and insular operculopremotor opercular and premotor operculum A covering flap in animals and insects, such as a gill cover or the lid of nits. operetta A lighter version of opera with a frivolous story and spoken dialogue. operettic of or relating to an operetta operettist The composer of an operetta. operidine The opioid analgesic drug pethidine. operon A unit of genetic material that functions in a coordinated manner by means of an operator, a promoter, and structural genes that are transcribed together. operonic Relating to operons operonically In an operonic manner operonization The formation of operons in a genome operose Of a person: busy, industrious, or painstaking. operosely In an operose manner. operoseness The state of being operose; tedium. operosity Laboriousness; painstakingness. opertaneous Concealed; private. opetide The open time; that part of the year outside Lent when there is no required fast. opeway A passageway. OPEX The 1959 United Nations programme to provide Operational and Executive staff as part of aid to certain countries. opgaaf A tax on produce, stock, and capitation. ophan A member of an order of wheel-like angels. ophanin A toxin present in the venom of the king cobra Ophiophagus hannah Opheim A surname from Norwegian. Ophelia A female given name from Ancient Greek. Ophelian Depicting or pertaining to Ophelia. Opheliana A female given name originating as a coinage, of rare usage. ophelic Of or pertaining to felworts, of a former plant genus, Ophelia (now included in Swertia), of the gentian family. opheliid Any polychaete worm of the family Opheliidae. ophelimity Economic satisfaction. ophiacanthid Any brittle star of the family Ophiacanthidae ophiacodont Any member of the Ophiacodontidae family of Carboniferous and Permian vertebrates ophiacodontid Any synapsid in the family Ophiacodontidae. ophiactid Any brittle star in the family Ophiactidae. ophiasis A form of alopecia areata characterized by the loss of hair in the shape of a wave at the circumference of the head. ophic Relating to snakes. ophicalcite ophite; verd antique ophicephalous snake-headed ophiceratid Any member of the family †Ophiceratidae of extinct ammonite cephalopods. ophichthid Any eel in the family Ophichthidae. ophicleide A keyed brass baritone bugle, now replaced by the tuba in orchestral music ophicleidist Someone who plays the ophicleide. ophiderpetontid Any tetrapod in the family Ophiderpetontidae. ophidian Any species of the suborder Serpentes; a snake or serpent. ophidianoside A particular steroid glycoside. ophidiarium A place for keeping snakes. ophidiasterid Any starfish in the family Ophidiasteridae. ophidic Relating to the Ophidia: the snakes and related reptiles. ophidiid Any in the family Ophidiidae of cusk-eels. ophidiiform Any ray-finned fish of the order Ophidiiformes ophidine The dipeptide β‐alanyl‐L‐3‐methylhistidine ophidioid Any of the family Ophidiidae of cusk-eels. ophidiomycosis Any disease caused by the fungus Ophidiomyces ophidiophobe An ophiophobe; one who fears snakes. ophidiophobia Ophiophobia; a fear of snakes. ophidiophobic relating to ophidiophobia; having fear of snakes ophidism Poisoning by snake venom. ophiobolin Any of a class of phytotoxic metabolites produced by certain fungi of the genus Helminthosporium ophiocarpine A protoberberine alkaloid. ophiocephalous ophicephalous ophiochitonid Any brittle star of the genus Ophiochiton ophiocistioid Any echinoderm of the class †Ophiocistioidea. ophiocomid Any brittle star in the family Ophiocomidae. ophiocordycipitaceous Of or relating to the Ophiocordycipitaceae. ophiodermatid Any brittle star in the family Ophiodermatidae. ophioglossaceous Belonging to the family Ophioglossaceae of ferns. ophioglossid An adder's tongue fern, or one similar to such a fern. ophiohelid Any brittle star of the family Ophiohelidae