| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| amyxia | (noun) a condition in which no mucus in produced | - |
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| anomalopteryx | (noun) the smallest moa; slender moa about the size of a large turkey | Synonyms: Anomalopteryx oweni |
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| apteryx | (noun) nocturnal flightless bird of New Zealand having a long neck and stout legs; only surviving representative of the order Apterygiformes | Synonyms: kiwi |
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| archaeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: Archaeopteryx lithographica, archeopteryx |
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| archeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: archaeopteryx, Archaeopteryx lithographica |
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| asphyxia | (noun) a condition in which insufficient or no oxygen and carbon dioxide are exchanged on a ventilatory basis; caused by choking or drowning or electric shock or poison gas | - |
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| asphyxiate | (verb) be asphyxiated; die from lack of oxygen | Synonyms: stifle, suffocate |
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| (verb) deprive of oxygen and prevent from breathing | Synonyms: smother, suffocate |
| (verb) impair the respiration of or obstruct the air passage of | Synonyms: choke, stifle, suffocate |
| asphyxiated | (adjective) in a state of asphyxia | - |
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| asphyxiating | (adjective) tending to deprive of oxygen | - |
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| asphyxiation | (noun) killing by depriving of oxygen | Synonyms: suffocation |
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| (noun) the condition of being deprived of oxygen (as by having breathing stopped) | Synonyms: suffocation |
| asphyxiator | (noun) a manually operated device for extinguishing small fires | Synonyms: extinguisher, fire extinguisher |
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| calyx | (noun) (botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green | - |
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| coccyx | (noun) the end of the vertebral column in humans and tailless apes | Synonyms: tail bone |
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| epicalyx | (noun) a group of bracts simulating a calyx as in a carnation or hibiscus | Synonyms: calycle, calyculus, false calyx |
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| myxedema | (noun) hypothyroidism marked by dry skin and swellings around lips and nose as well as mental deterioration | Synonyms: myxoedema |
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| myxobacter | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacteria, myxobacterium, slime bacteria |
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| myxobacteria | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacter, myxobacterium, slime bacteria |
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| myxobacterium | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacter, myxobacteria, slime bacteria |
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| myxoedema | (noun) hypothyroidism marked by dry skin and swellings around lips and nose as well as mental deterioration | Synonyms: myxedema |
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| myxoma | (noun) a benign tumor of connective tissue containing jellylike material | - |
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| myxomatosis | (noun) a viral disease (usually fatal) of rabbits | - |
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| myxomycete | (noun) a slime mold of the class Myxomycetes | Synonyms: acellular slime mold, plasmodial slime mold, true slime mold |
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| myxosporidian | (noun) mostly parasitic in fishes and including various serious pathogens | - |
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| myxovirus | (noun) any of a group of RNA viruses including those that cause influenza and mumps | - |
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| onyx | (noun) a chalcedony with alternating black and white bands; used in making cameos | - |
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| onyxis | (noun) toenail having its free tip or edges embedded in the surrounding flesh | Synonyms: ingrown toenail |
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| orthomyxovirus | (noun) a group of viruses including those causing influenza | - |
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| oryx | (noun) large African antelope with long straight nearly upright horns | Synonyms: pasang |
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| paramyxovirus | (noun) a group of viruses including those causing mumps and measles | - |
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| polymyxin | (noun) any of several toxic antibiotics obtained from a particular soil bacterium | - |
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| pyx | (noun) any receptacle in which wafers for the Eucharist are kept | Synonyms: pix |
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| (noun) a chest in which coins from the mint are held to await assay | Synonyms: pix, pix chest, pyx chest |
| pyxidium | (noun) fruit of such plants as the plantain; a capsule whose upper part falls off when the seeds are released | Synonyms: pyxis |
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| pyxie | (noun) creeping evergreen shrub having narrow overlapping leaves and early white star-shaped flowers; of the pine barrens of New Jersey and the Carolinas | Synonyms: pixie, pixy, Pyxidanthera barbulata |
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| pyxis | (noun) a small box used by ancient Greeks to hold medicines | - |
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| (noun) fruit of such plants as the plantain; a capsule whose upper part falls off when the seeds are released | Synonyms: pyxidium |
| sardonyx | (noun) an onyx characterized by parallel layers of sard and a different colored mineral | - |
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