| adenoidectomy | (noun) surgical removal of the adenoids; commonly performed along with tonsillectomy | - |
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| adrenalectomy | (noun) surgical removal of one or both adrenal glands | Synonyms: suprarenalectomy |
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| appendectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendicectomy |
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| appendicectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendectomy |
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| architectonics | (noun) the science of architecture | Synonyms: tectonics |
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| autoinjector | (noun) a hypodermic syringe to use in injecting yourself with a liquid | - |
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| callosectomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosotomy |
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| cholecystectomy | (noun) surgical removal of the gall bladder (usually for relief of gallstone pain) | - |
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| clitoridectomy | (noun) excision of the clitoris | Synonyms: female circumcision |
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| collector | (noun) the electrode in a transistor through which a primary flow of carriers leaves the region between the electrodes | - |
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| (noun) a crater that has collected cosmic material hitting the earth | - |
| (noun) a person who is employed to collect payments (as for rent or taxes) | Synonyms: accumulator, gatherer |
| (noun) a person who collects things | Synonyms: aggregator |
| connector | (noun) an instrumentality that connects | Synonyms: connecter, connection, connective, connexion |
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| convector | (noun) a space heater that transfers heat to the surrounding air by convection | - |
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| cytoarchitectonics | (noun) the cellular composition of a bodily structure | Synonyms: cytoarchitecture |
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| defector | (noun) a person who abandons their duty (as on a military post) | Synonyms: deserter |
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| deflector | (noun) a device intended to turn aside the flow of something (water or air or smoke etc) | - |
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| detector | (noun) any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner | Synonyms: sensing element, sensor |
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| (noun) electronic equipment that detects the presence of radio signals or radioactivity | - |
| (noun) rectifier that extracts modulation from a radio carrier wave | Synonyms: demodulator |
| dialectology | (noun) the branch of philology that is devoted to the study of dialects | - |
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| director | (noun) someone who controls resources and expenditures | Synonyms: manager, managing director |
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| (noun) the person who leads a musical group | Synonyms: conductor, music director |
| (noun) someone who supervises the actors and directs the action in the production of a show | Synonyms: theater director, theatre director |
| (noun) member of a board of directors | - |
| (noun) the person who directs the making of a film | Synonyms: film director |
| directorate | (noun) a group of persons chosen to govern the affairs of a corporation or other large institution | Synonyms: board of directors |
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| directorship | (noun) the position of a director of a business concern | - |
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| directory | (noun) an alphabetical list of names and addresses | - |
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| (noun) (computer science) a listing of the files stored in memory (usually on a hard disk) | - |
| disinfector | (noun) an apparatus for applying disinfectants. | - |
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| ectoblast | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoderm, exoderm |
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| ectoderm | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoblast, exoderm |
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| ectomorph | (noun) a person with a thin body | - |
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| ectomorphy | (noun) slender, weak, and lightweight | Synonyms: asthenic type |
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| ectoparasite | (noun) any external parasitic organism (as fleas) | Synonyms: ectozoan, ectozoon, epizoan, epizoon |
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| ectopia | (noun) abnormal position of a part or organ (especially at the time of birth) | - |
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| ectoplasm | (noun) the outer granule-free layer of cytoplasm | - |
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| (noun) (spiritualism) a substance supposed to emanate from the body of the medium during a trance | - |
| ectoproct | (noun) sessile mossy aquatic animal having the anus of the polyp outside the crown of tentacles | - |
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| ectotherm | (noun) an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals | Synonyms: poikilotherm |
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| ectozoan | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoon, epizoan, epizoon |
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| ectozoon | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, epizoan, epizoon |
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| effector | (noun) an organ (a gland or muscle) that becomes active in response to nerve impulses | - |
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| (noun) a nerve fiber that terminates on a muscle or gland and stimulates contraction or secretion | - |
| (noun) one who brings about a result or event; one who accomplishes a purpose | Synonyms: effecter |
| ejector | (noun) a mechanism in a firearm that ejects the empty shell case after firing | Synonyms: cartridge ejector |
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| (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, injector, steam ejector, steam injector, thermocompressor |
| (noun) a person who ousts or supplants someone else | Synonyms: ouster |
| elector | (noun) a citizen who has a legal right to vote | Synonyms: voter |
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| electorate | (noun) the body of enfranchised citizens; those qualified to vote | - |
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| embolectomy | (noun) surgical removal of an embolus (usually from an artery) | - |
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| endarterectomy | (noun) surgical removal of the inner lining of an artery that is clogged with atherosclerosis | - |
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| expectorant | (noun) a medicine promoting expectoration | Synonyms: expectorator |
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| expectoration | (noun) the act of spitting (forcefully expelling saliva) | Synonyms: spit, spitting |
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| (noun) the process of coughing up and spitting out | - |
| expectorator | (noun) a medicine promoting expectoration | Synonyms: expectorant |
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| (noun) a person who spits (ejects saliva or phlegm from the mouth) | Synonyms: spitter |
| gastrectomy | (noun) surgical removal of all or part of the stomach | - |
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| haemorrhoidectomy | (noun) surgical procedure for tying hemorrhoids and excising them | Synonyms: hemorrhoidectomy |
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| hectogram | (noun) 100 grams | Synonyms: hg |
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| hectograph | (noun) duplicator consisting of a gelatin plate from which ink can be taken to make a copy | Synonyms: heliotype |
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| hectoliter | (noun) a metric unit of volume or capacity equal to 100 liters | Synonyms: hectolitre, hl |
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| hectolitre | (noun) a metric unit of volume or capacity equal to 100 liters | Synonyms: hectoliter, hl |
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| hectometer | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometre, hm |
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| hectometre | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometer, hm |
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| hemorrhoidectomy | (noun) surgical procedure for tying hemorrhoids and excising them | Synonyms: haemorrhoidectomy |
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| hypophysectomy | (noun) surgical removal of the pituitary gland | - |
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| hysterectomy | (noun) surgical removal of the uterus | - |
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| injector | (noun) a contrivance for injecting (e.g., water into the boiler of a steam engine or particles into an accelerator etc.) | - |
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| (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, ejector, steam ejector, steam injector, thermocompressor |
| inspector | (noun) an investigator who observes carefully | Synonyms: examiner |
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| (noun) a high ranking police officer | - |
| inspectorate | (noun) a body of inspectors | - |
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| inspectorship | (noun) the office of inspector | - |
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| iridectomy | (noun) an eye operation that treats closed-angle glaucoma by surgical removal of part of the iris of the eye | - |
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| laminectomy | (noun) surgical removal of the bony arches on one or more vertebrae | - |
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| laryngectomy | (noun) surgical removal of part or all of the larynx (usually to treat cancer of the larynx) | - |
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| lector | (noun) a public lecturer at certain universities | Synonyms: lecturer, reader |
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| (noun) someone who reads the lessons in a church service; someone ordained in a minor order of the Roman Catholic Church | Synonyms: reader |
| lipectomy | (noun) plastic surgery involving the breakdown and removal of fatty tissue | Synonyms: selective lipectomy |
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| lobectomy | (noun) surgical removal of a lobe from any organ of the body (as the lung or brain) | - |
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| lumpectomy | (noun) surgical removal of a tumor without removing much of the surrounding tissue or lymph nodes; performed in some cases of breast cancer | - |
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| mastectomy | (noun) surgical removal of a breast to remove a malignant tumor | - |
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| mastoidectomy | (noun) surgical removal of some or all of the mastoid process | - |
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| meniscectomy | (noun) surgical removal of the meniscus of the knee | - |
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| myringectomy | (noun) surgical removal of the eardrum | - |
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| nephrectomy | (noun) surgical removal of a kidney | - |
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| neurectomy | (noun) surgical removal of all or part of a nerve | - |
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| objector | (noun) a person who dissents from some established policy | Synonyms: contestant, dissenter, dissident, protester |
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| oophorectomy | (noun) surgical removal of one or both ovaries | Synonyms: ovariectomy |
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| oophorosalpingectomy | (noun) surgical removal of one or both ovaries and the corresponding Fallopian tubes | - |
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| ophthalmectomy | (noun) surgical removal of an eye | - |
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| orchidectomy | (noun) surgical removal of one or both testicles | Synonyms: orchiectomy |
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| orchiectomy | (noun) surgical removal of one or both testicles | Synonyms: orchidectomy |
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| ovariectomy | (noun) surgical removal of one or both ovaries | Synonyms: oophorectomy |
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| pancreatectomy | (noun) surgical removal of part or all of the pancreas | - |
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| panhysterectomy | (noun) surgical removal of the uterus and the ovaries and oviducts and cervix and related lymph nodes | Synonyms: radical hysterectomy |
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| pectoral | (noun) an adornment worn on the chest or breast | Synonyms: pectoral medallion |
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| (noun) either of two large muscles of the chest | Synonyms: musculus pectoralis, pecs, pectoral muscle, pectoralis |
| pectoralis | (noun) either of two large muscles of the chest | Synonyms: musculus pectoralis, pecs, pectoral, pectoral muscle |
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| phlebectomy | (noun) surgical removal or all or part of a vein; sometimes done in cases of severe varicose veins | - |
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| plectognath | (noun) tropical marine fishes having the teeth fused into a beak and thick skin covered with bony plates or spines | Synonyms: plectognath fish |
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| pneumonectomy | (noun) surgical removal of a lung (usually to treat lung cancer) | - |
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| polypectomy | (noun) surgical removal of a polyp | - |
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| projector | (noun) an optical instrument that projects an enlarged image onto a screen | - |
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| (noun) an optical device for projecting a beam of light | - |
| prospector | (noun) someone who explores an area for mineral deposits | - |
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| prostatectomy | (noun) surgical removal of part or all of the prostate gland | - |
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| protector | (noun) a person who cares for persons or property | Synonyms: defender, guardian, shielder |
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| protectorate | (noun) a state or territory partly controlled by (but not a possession of) a stronger state but autonomous in internal affairs; protectorates are established by treaty | Synonyms: associated state |
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| protectorship | (noun) the position of protector | - |
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| recto | (noun) right-hand page | - |
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| rectocele | (noun) protrusion or herniation of the rectum into the vagina; can occur if pelvic muscles are weakened by childbirth | Synonyms: proctocele |
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| rectoplasty | (noun) reconstructive surgery of the anus or rectum | Synonyms: proctoplasty |
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| rector | (noun) a person authorized to conduct religious worship | Synonyms: curate, minister, minister of religion, parson, pastor |
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| rectorate | (noun) the office or station of a rector | Synonyms: rectorship |
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| rectorship | (noun) the office or station of a rector | Synonyms: rectorate |
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| rectory | (noun) an official residence provided by a church for its parson or vicar or rector | Synonyms: parsonage, vicarage |
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| refectory | (noun) a communal dining-hall (usually in a monastery) | - |
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| reflectometer | (noun) a meter that measures the reflectance of a surface | - |
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