| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| cirrostratus | (noun) a thin uniform layer of hazy cloud at high altitude | Synonyms: cirrostratus cloud |
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| defroster | (noun) heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane) | Synonyms: deicer |
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| dihydrostreptomycin | (noun) antibiotic consisting of a hydrogenated form of streptomycin; used against tuberculosis and tularemia and Gram-negative organisms | - |
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| electrostatics | (noun) the branch of physics that deals with static electricity | - |
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| enterostenosis | (noun) abnormal narrowing of the intestine | - |
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| enterostomy | (noun) surgical operation that creates a permanent opening through the abdominal wall into the intestine | Synonyms: enterotomy |
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| frost | (noun) weather cold enough to cause freezing | Synonyms: freeze |
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| (noun) the formation of frost or ice on a surface | Synonyms: icing |
| (noun) ice crystals forming a white deposit (especially on objects outside) | Synonyms: hoar, hoarfrost, rime |
| frostbite | (noun) destruction of tissue by freezing and characterized by tingling, blistering and possibly gangrene | Synonyms: cryopathy |
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| frostiness | (noun) coldness as evidenced by frost | - |
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| (noun) a silvery-white color | Synonyms: hoariness |
| frosting | (noun) a flavored sugar topping used to coat and decorate cakes | Synonyms: ice, icing |
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| frostweed | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostwort, Helianthemum canadense |
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| (noun) tall perennial herb having clusters of white flowers; the eastern United States | Synonyms: frost-weed, Verbesina virginica, Virginia crownbeard |
| frostwort | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostweed, Helianthemum canadense |
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| gastroenterostomy | (noun) surgical creation of an opening between the stomach wall and the small intestines; performed when the normal opening has been eliminated | - |
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| gastrostomy | (noun) surgical creation of an opening through the abdominal wall into the stomach (as for gastrogavage) | - |
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| gyrostabiliser | (noun) a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane | Synonyms: gyrostabilizer |
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| gyrostabilizer | (noun) a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane | Synonyms: gyrostabiliser |
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| heterostracan | (noun) extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian | - |
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| hoarfrost | (noun) ice crystals forming a white deposit (especially on objects outside) | Synonyms: frost, hoar, rime |
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| hydrostaticity | (noun) The condition of relating to fluids, especially to the pressure that they exert or transmit. | - |
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| hydrostatics | (noun) study of the mechanical properties of fluids that are not in motion | - |
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| permafrost | (noun) ground that is permanently frozen | - |
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| prostaglandin | (noun) a potent substance that acts like a hormone and is found in many bodily tissues (and especially in semen); produced in response to trauma and may affect blood pressure and metabolism and smooth muscle activity | - |
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| prostate | (noun) a firm partly muscular chestnut sized gland in males at the neck of the urethra; produces a viscid secretion that is the fluid part of semen | Synonyms: prostate gland |
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| prostatectomy | (noun) surgical removal of part or all of the prostate gland | - |
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| prostatitis | (noun) inflammation of the prostate gland characterized by perineal pain and irregular urination and (if severe) chills and fever | - |
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| prostheon | (noun) craniometric point that is the most anterior point in the midline on the alveolar process of the maxilla | Synonyms: alveolar point, prosthion |
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| prosthesis | (noun) corrective consisting of a replacement for a part of the body | Synonyms: prosthetic device |
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| prosthetics | (noun) the branch of medicine dealing with the production and use of artificial body parts | - |
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| prosthetist | (noun) an expert in prosthetics | - |
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| prosthion | (noun) craniometric point that is the most anterior point in the midline on the alveolar process of the maxilla | Synonyms: alveolar point, prostheon |
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| prosthodontia | (noun) the branch of dentistry dealing with the replacement of teeth and related mouth or jaw structures by artificial devices | Synonyms: prosthodontics |
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| prosthodontics | (noun) the branch of dentistry dealing with the replacement of teeth and related mouth or jaw structures by artificial devices | Synonyms: prosthodontia |
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| prosthodontist | (noun) a dentist who is expert in prosthodontics | - |
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| prostitute | (noun) a woman who engages in sexual intercourse for money | Synonyms: bawd, cocotte, cyprian, fancy woman, harlot, lady of pleasure, sporting lady, tart, whore, woman of the street, working girl |
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| prostitution | (noun) offering sexual intercourse for pay | Synonyms: harlotry, whoredom |
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| prostration | (noun) the act of assuming a prostrate position | - |
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| (noun) abject submission; the emotional equivalent of prostrating your body | - |
| (noun) an abrupt failure of function or complete physical exhaustion | Synonyms: collapse |
| pyrostat | (noun) a thermostat that operates at very high temperatures | - |
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| roster | (noun) a list of names | Synonyms: roll |
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| rostrum | (noun) beaklike projection of the anterior part of the head of certain insects such as e.g. weevils | Synonyms: snout |
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| (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, soapbox, stump |
| throstle | (noun) common Old World thrush noted for its song | Synonyms: mavis, song thrush, Turdus philomelos |
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| (noun) a spinning machine formerly used to twist and wind fibers of cotton or wool continuously | - |
| ureterostenosis | (noun) stenosis of the ureter | - |
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| xerostomia | (noun) abnormal dryness of the mouth resulting from decreased secretion of saliva | Synonyms: dry mouth |
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