| carrizo | (noun) tall North American reed having relative wide leaves and large plumelike panicles; widely distributed in moist areas; used for mats, screens and arrow shafts | Synonyms: common reed, ditch reed, Phragmites communis |
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| chorizo | (noun) a spicy Spanish pork sausage | - |
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| epizoan | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, ectozoon, epizoon |
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| epizoon | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, ectozoon, epizoan |
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| horizon | (noun) the range of interest or activity that can be anticipated | Synonyms: purview, view |
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| (noun) the line at which the sky and Earth appear to meet | Synonyms: apparent horizon, sensible horizon, skyline, visible horizon |
| (noun) a specific layer or stratum of soil or subsoil in a vertical cross section of land | - |
| (noun) the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth | Synonyms: celestial horizon |
| horizontal | (noun) something that is oriented horizontally | - |
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| horizontality | (noun) the quality of being parallel to the horizon | - |
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| mestizo | (noun) a person of mixed racial ancestry (especially mixed European and Native American ancestry) | - |
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| rhizoctinia | (noun) any fungus now or formerly belonging to the form genus Rhizoctinia | - |
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| rhizoid | (noun) any of various slender filaments that function as roots in mosses and ferns and fungi etc | - |
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| rhizome | (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rootstalk, rootstock |
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| rhizomorph | (noun) a dense mass of hyphae forming a root-like structure characteristic of many fungi | - |
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| rhizopod | (noun) protozoa characterized by a pseudopod | Synonyms: rhizopodan |
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| rhizopodan | (noun) protozoa characterized by a pseudopod | Synonyms: rhizopod |
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| rhizopus | (noun) any of various rot causing fungi of the genus Rhizopus | - |
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| rhizotomy | (noun) surgical procedure in which spinal nerve roots are cut; done (anterior roots) to relieve intractable pain or (posterior roots) to stop severe muscle spasms | - |
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| schizocarp | (noun) a dry dehiscent fruit that at maturity splits into two or more parts each with a single seed | - |
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| schizogony | (noun) asexual reproduction by multiple fission; characteristic of many sporozoan protozoans | - |
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| schizoid | (noun) characterized by symptoms similar to but less severe than schizophrenia | Synonyms: schizotypal personality |
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| schizopetalon | (noun) a dainty South American annual having deeply pinnatifid leaves and racemes of fringed almond-scented purple-white flowers | Synonyms: Schizopetalon walkeri |
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| schizophrenia | (noun) any of several psychotic disorders characterized by distortions of reality and disturbances of thought and language and withdrawal from social contact | Synonyms: dementia praecox, schizophrenic disorder, schizophrenic psychosis |
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| schizophrenic | (noun) someone who is afflicted with schizophrenia | - |
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| schizothymia | (noun) resembling schizophrenia but remaining within the bounds of normality | - |
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| vizor | (noun) a brim that projects to the front to shade the eyes | Synonyms: bill, eyeshade, peak, visor |
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| (noun) a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face | Synonyms: visor |