| acanthocephalan | (noun) any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines | Synonyms: spiny-headed worm |
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| cephalalgia | (noun) pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs | Synonyms: head ache, headache |
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| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| chachalaca | (noun) slender arboreal guan resembling a wild turkey; native to Central America and Mexico; highly regarded as game birds | - |
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| chalaza | (noun) one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell | - |
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| (noun) basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined | - |
| chalazion | (noun) a small sebaceous cyst of the eyelid resulting when a Meibomian gland is blocked | Synonyms: Meibomian cyst |
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| encephalartos | (noun) any of numerous cycads of the genus Encephalartos having stout cylindrical trunks and a terminal crown of long often spiny pinnate leaves | - |
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| epithalamium | (noun) an ode honoring a bride and bridegroom | - |
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| exhalation | (noun) the act of expelling air from the lungs | Synonyms: breathing out, expiration |
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| (noun) exhaled breath | Synonyms: halitus |
| halal | (noun) (Islam) meat from animals that have been slaughtered in the prescribed way according to the shariah | - |
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| holocephalan | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalian |
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| hypothalamus | (noun) a basal part of the diencephalon governing autonomic nervous system | - |
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| inhalant | (noun) a medication to be taken by inhaling it | Synonyms: inhalation |
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| (noun) something that is inhaled | - |
| inhalation | (noun) the act of inhaling; the drawing in of air (or other gases) as in breathing | Synonyms: aspiration, breathing in, inspiration, intake |
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| (noun) a medication to be taken by inhaling it | Synonyms: inhalant |
| inhalator | (noun) a dispenser that produces a chemical vapor to be inhaled in order to relieve nasal congestion | Synonyms: inhaler |
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| (noun) a breathing device for administering long-term artificial respiration | Synonyms: respirator |
| isochalaz | (noun) a line indicating a constant frequency of hail storms. | - |
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| lauhala | (noun) Polynesian screw pine | Synonyms: Pandanus tectorius, textile screw pine |
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| melphalan | (noun) antineoplastic drug (trade name Alkeran) used to treat multiple myeloma and some other malignancies | Synonyms: Alkeran |
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| nonchalance | (noun) the trait of remaining calm and seeming not to care; a casual lack of concern | Synonyms: indifference, unconcern |
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| phalacrosis | (noun) the condition of having no hair on the top of the head | Synonyms: baldness |
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| phalanger | (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: opossum, possum |
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| phalangist | (noun) a Spanish member of General Franco's political party | Synonyms: falangist |
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| phalangitis | (noun) inflammation of a finger or toe | - |
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| phalanx | (noun) any of the bones of the fingers or toes | - |
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| (noun) a body of troops in close array | - |
| (noun) any closely ranked crowd of people | - |
| phalarope | (noun) small sandpiper-like shorebird having lobate toes and being good swimmers; breed in the Arctic and winter in the tropics | - |
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| prothalamion | (noun) a song in celebration of a marriage | Synonyms: prothalamium |
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| prothalamium | (noun) a song in celebration of a marriage | Synonyms: prothalamion |
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| subthalamus | (noun) the ventral part of the thalamus | - |
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| thalamus | (noun) large egg-shaped structures of grey matter that form the dorsal subdivision of the diencephalon | - |
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| thalassaemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassemia |
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| thalassemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassaemia |
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