| acrobat | (noun) an athlete who performs acts requiring skill and agility and coordination | - |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aerobe | (noun) an organism (especially a bacterium) that requires air or free oxygen for life | - |
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| aerobics | (noun) exercise that increases the need for oxygen | Synonyms: aerobic exercise |
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| aerobiosis | (noun) life sustained in the presence of air or oxygen | - |
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| agrobiology | (noun) the study of plant nutrition and growth especially as a way to increase crop yield | - |
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| algarobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarroba, algarrobilla |
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| algarroba | (noun) evergreen Mediterranean tree with edible pods; the biblical carob | Synonyms: carob, carob bean tree, carob tree, Ceratonia siliqua |
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| (noun) mesquite of Gulf Coast and Caribbean Islands from Mexico to Venezuela | Synonyms: Prosopis juliflora, Prosopis juliiflora |
| (noun) long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute | Synonyms: algarroba bean, carob, carob bean, locust bean, locust pod |
| (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarrobilla |
| algarrobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarroba |
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| anaerobe | (noun) an organism (especially a bacterium) that does not require air or free oxygen to live | - |
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| antimicrobial | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobic, disinfectant, germicide |
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| antimicrobic | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, disinfectant, germicide |
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| approbation | (noun) official recognition or approval | - |
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| (noun) official approval | - |
| araroba | (noun) a bitter yellow powder used to treat skin diseases | Synonyms: chrysarobin, Goa powder |
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| arroba | (noun) a unit of weight used in some Spanish speaking countries | - |
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| (noun) a liquid measure (with different values) used in some Spanish speaking countries | - |
| astrobiology | (noun) the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life | Synonyms: exobiology, space biology |
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| bathrobe | (noun) a loose-fitting robe of towelling; worn after a bath or swim | - |
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| carob | (noun) powder from the ground seeds and pods of the carob tree; used as a chocolate substitute | Synonyms: carob powder, Saint-John's-bread |
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| (noun) evergreen Mediterranean tree with edible pods; the biblical carob | Synonyms: algarroba, carob bean tree, carob tree, Ceratonia siliqua |
| (noun) long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute | Synonyms: algarroba, algarroba bean, carob bean, locust bean, locust pod |
| chlorobenzene | (noun) a colorless volatile flammable liquid with an almond odor that is made from chlorine and benzene; used as a solvent and in the production of phenol and DDT and other organic compounds | - |
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| chlorobenzylidenemalononitrile | (noun) a tear gas that is stronger than CN gas but wears off faster; can be deployed by grenades or cluster bombs; can cause skin burns and fatal pulmonary edema | Synonyms: CS gas |
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| chrysarobin | (noun) a bitter yellow powder used to treat skin diseases | Synonyms: araroba, Goa powder |
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| corroboration | (noun) confirmation that some fact or statement is true through the use of documentary evidence | Synonyms: certification, documentation |
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| coscoroba | (noun) large white South American bird intermediate in some respects between ducks and swans | - |
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| dendrobium | (noun) a plant of the genus Dendrobium having stems like cane and usually showy racemose flowers | - |
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| disapprobation | (noun) an expression of strong disapproval; pronouncing as wrong or morally culpable | Synonyms: condemnation |
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| enterobacteria | (noun) rod-shaped Gram-negative bacteria; most occur normally or pathogenically in intestines of humans and other animals | Synonyms: enteric bacteria, enterics, entric |
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| enterobiasis | (noun) an infestation with or a resulting infection caused by the pinworm Enterobius vermicularis; occurs especially in children | - |
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| erythroblast | (noun) a nucleated cell in bone marrow from which red blood cells develop | - |
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| erythroblastosis | (noun) a blood disease characterized by the abnormal presence of erythroblasts in the blood | - |
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| fibroblast | (noun) a cell from which connective tissue develops | - |
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| fluoroboride | (noun) a salt of fluoroboric acid | - |
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| graverobber | (noun) someone who takes bodies from graves and sells them for anatomical dissection | Synonyms: body snatcher, ghoul |
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| (noun) someone who steals valuables from graves or crypts | - |
| heartthrob | (noun) an object of infatuation | - |
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| hemerobiid | (noun) small dark-colored lacewing fly | Synonyms: brown lacewing, hemerobiid fly |
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| improbability | (noun) the quality of being improbable | Synonyms: improbableness |
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| improbableness | (noun) the quality of being improbable | Synonyms: improbability |
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| jeroboam | (noun) a large wine bottle (holds 4/5 of a gallon) | Synonyms: double-magnum |
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| katharobe | (noun) an organism that lives in an oxygenated medium lacking organic matter | - |
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| macrobiotics | (noun) the theory of promoting health and longevity by means of diet (especially whole beans and grains) | - |
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| meprobamate | (noun) a sedative and tranquilizer (trade name Miltown and Equanil and Meprin) used to treat muscle tension and anxiety | Synonyms: Equanil, Meprin, Miltown |
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| merobenthos | (noun) benthos consisting of organisms in pre-adult stages that later become adult in the plankton. | - |
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| microbalance | (noun) balance for weighing very small objects | - |
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| microbar | (noun) the absolute unit of pressure equal to one dyne per square centimeter | Synonyms: bar absolute, barye |
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| microbat | (noun) typically having large ears and feeding primarily on insects; worldwide in distribution | Synonyms: carnivorous bat |
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| microbe | (noun) a minute life form (especially a disease-causing bacterium); the term is not in technical use | Synonyms: bug, germ |
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| microbenthos | (noun) microscopic benthic organisms that are less than 0.1 mm in size. | - |
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| microbiologist | (noun) a specialist in microbiology | - |
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| microbiology | (noun) the branch of biology that studies microorganisms and their effects on humans | - |
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| microblog | (noun) a blog in which there is a limitation on the length of individual postings. | - |
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| microbrachia | (noun) abnormally small arms | - |
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| microbrewery | (noun) a small brewery; consumption of the product is mainly elsewhere | - |
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| myrobalan | (noun) small Asiatic tree bearing edible red or yellow fruit | Synonyms: cherry plum, myrobalan plum, Prunus cerasifera |
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| necrobiosis | (noun) (physiology) the normal degeneration and death of living cells (as in various epithelial cells) | Synonyms: cell death |
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| nephroblastoma | (noun) malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass | Synonyms: adenomyosarcoma, embryoma of the kidney, Wilms' tumor, Wilms tumour |
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| neurobiologist | (noun) a specialist in neurobiology | - |
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| neurobiology | (noun) the branch of biology that deals with the anatomy and physiology and pathology of the nervous system | - |
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| neuroblast | (noun) a cell from which a nerve cell develops | - |
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| neuroblastoma | (noun) malignant tumor containing embryonic nerve cells; usually metastasizes quickly | - |
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| nitrobacteria | (noun) soil bacteria that convert nitrites to nitrates | Synonyms: nitric bacteria |
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| nitrobacterium | (noun) any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates | - |
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| nitrobenzene | (noun) a poisonous oily water-soluble liquid used as a solvent and in the manufacture of aniline | - |
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| opprobrium | (noun) a state of extreme dishonor | Synonyms: infamy |
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| (noun) state of disgrace resulting from public abuse | Synonyms: obloquy |
| probabilism | (noun) (philosophy) the doctrine that (since certainty is unattainable) probability is a sufficient basis for belief and action | - |
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| (noun) a Roman Catholic system of casuistry that when expert opinions differ an actor can follow any solidly probable opinion that he wishes even though some different opinion might be more probable | - |
| probability | (noun) the quality of being probable; a probable event or the most probable event | - |
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| (noun) a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible | Synonyms: chance |
| probable | (noun) an applicant likely to be chosen | - |
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| probate | (noun) the act of proving that an instrument purporting to be a will was signed and executed in accord with legal requirements | - |
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| (noun) a judicial certificate saying that a will is genuine and conferring on the executors the power to administer the estate | Synonyms: probate will |
| probation | (noun) (law) a way of dealing with offenders without imprisoning them; a defendant found guilty of a crime is released by the court without imprisonment subject to conditions imposed by the court | - |
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| (noun) a trial period during which an offender has time to redeem himself or herself | - |
| (noun) a trial period during which your character and abilities are tested to see whether you are suitable for work or for membership | - |
| probationer | (noun) someone released on probation or on parole | Synonyms: parolee |
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| (noun) a nurse in training who is undergoing a trial period | Synonyms: student nurse |
| probe | (noun) an exploratory action or expedition | - |
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| (noun) an investigation conducted using a flexible surgical instrument to explore an injury or a body cavity | - |
| (noun) a flexible slender surgical instrument with a blunt end that is used to explore wounds or body cavities | - |
| (noun) an inquiry into unfamiliar or questionable activities | Synonyms: investigation |
| probenecid | (noun) a uricosuric drug that reduces the level of uric acid in the blood; used to treat gout | - |
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| probiotic | (noun) a beneficial bacterium found in the intestinal tract of healthy mammals; often considered to be a plant | Synonyms: probiotic bacterium, probiotic flora, probiotic microflora |
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| (noun) A dietary supplement containing live bacteria, usually taken after a course of antibiotics to replenish the damaged gastrointestinal flora. | - |
| probity | (noun) complete and confirmed integrity; having strong moral principles | - |
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| problem | (noun) a source of difficulty | Synonyms: trouble |
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| (noun) a question raised for consideration or solution | - |
| (noun) a state of difficulty that needs to be resolved | Synonyms: job |
| problematics | (noun) the uncertainties or difficulties inherent in a situation or plan. | - |
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| proboscidean | (noun) massive herbivorous mammals having tusks and a long trunk | Synonyms: proboscidian |
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| proboscidian | (noun) massive herbivorous mammals having tusks and a long trunk | Synonyms: proboscidean |
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| proboscis | (noun) a long flexible snout as of an elephant | Synonyms: trunk |
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| (noun) the human nose (especially when it is large) | - |
| reprobate | (noun) a person without moral scruples | Synonyms: miscreant |
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| reprobation | (noun) severe disapproval | - |
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| (noun) rejection by God; the state of being condemned to eternal misery in Hell | - |
| robalo | (noun) a kind of percoid fish | - |
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| robber | (noun) a thief who steals from someone by threatening violence | - |
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| robbery | (noun) larceny by threat of violence | - |
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| (noun) plundering during riots or in wartime | Synonyms: looting |
| robe | (noun) any loose flowing garment | - |
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| (noun) outerwear consisting of a long flowing garment used for official or ceremonial occasions | Synonyms: gown |
| robin | (noun) large American thrush having a rust-red breast and abdomen | Synonyms: American robin, Turdus migratorius |
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| (noun) small Old World songbird with a reddish breast | Synonyms: Erithacus rubecola, Old World robin, redbreast, robin redbreast |
| roble | (noun) tall graceful deciduous California oak having leathery leaves and slender pointed acorns | Synonyms: California white oak, Quercus lobata, valley oak, valley white oak |
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| (noun) large tree of Trinidad and Guyana having odd-pinnate leaves and violet-scented axillary racemes of yellow flowers and long smooth pods; grown as a specimen in parks and large gardens | Synonyms: Platymiscium trinitatis |
| robocall | (noun) An phone call made by an automated service | - |
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| robot | (noun) a mechanism that can move automatically | Synonyms: automaton, golem |
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| robotics | (noun) the area of AI concerned with the practical use of robots | - |
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| robustness | (noun) the property of being strong and healthy in constitution | Synonyms: hardiness, lustiness |
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| (noun) the characteristic of being strong enough to withstand intellectual challenge | - |
| saprobe | (noun) an organism that lives in and derives its nourishment from organic matter in stagnant or foul water | - |
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| searobin | (noun) American gurnard; mostly found in bays and estuaries | Synonyms: sea robin |
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| sideroblast | (noun) an erythroblast having granules of ferritin | - |
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| strobe | (noun) scientific instrument that provides a flashing light synchronized with the periodic movement of an object; can make moving object appear stationary | Synonyms: strobe light, stroboscope |
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| strobile | (noun) cone-shaped mass of ovule- or spore-bearing scales or bracts | Synonyms: cone, strobilus |
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| strobilus | (noun) cone-shaped mass of ovule- or spore-bearing scales or bracts | Synonyms: cone, strobile |
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| stroboscope | (noun) scientific instrument that provides a flashing light synchronized with the periodic movement of an object; can make moving object appear stationary | Synonyms: strobe, strobe light |
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| telerobotics | (noun) the area of robotics that is concerned with the control of robots from a distance | - |
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| throb | (noun) an instance of rapid strong pulsation (of the heart) | Synonyms: pounding, throbbing |
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| (noun) a deep pulsating type of pain | - |
| throbbing | (noun) an instance of rapid strong pulsation (of the heart) | Synonyms: pounding, throb |
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| (noun) a sound with a strong rhythmic beat | - |