| copperplate | (noun) an engraving consisting of a smooth plate of copper that has been etched or engraved | Synonyms: copperplate engraving |
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| (noun) a print made from an engraved copperplate | - |
| (noun) a graceful style of handwriting based on the writing used on copperplate engravings | - |
| hyperparathyroidism | (noun) excessive secretion of parathyroid hormone resulting in abnormally high levels of calcium in the blood; can affect many systems of the body (especially causing bone resorption and osteoporosis) | - |
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| hyperpiesia | (noun) persistent and pathological high blood pressure for which no specific cause can be found | Synonyms: essential hypertension, hyperpiesis |
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| hyperpiesis | (noun) persistent and pathological high blood pressure for which no specific cause can be found | Synonyms: essential hypertension, hyperpiesia |
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| hyperpigmentation | (noun) unusual darkening of the skin | - |
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| hyperpituitarism | (noun) excessive activity of the pituitary gland (especially overactivity of the anterior lobe which leads to excess secretion of growth hormone) | - |
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| hyperplasia | (noun) abnormal increase in number of cells | - |
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| hyperpnea | (noun) energetic (deep and rapid) respiration that occurs normally after exercise or abnormally with fever or various disorders | - |
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| hyperpyrexia | (noun) extremely high fever (especially in children) | - |
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| perpendicular | (noun) an extremely steep face | - |
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| (noun) a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point | Synonyms: plumb line |
| (noun) a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting | Synonyms: English-Gothic, English-Gothic architecture, perpendicular style |
| (noun) a straight line at right angles to another line | - |
| perpendicularity | (noun) the quality of being at right angles to a given line or plane (especially the plane of the horizon) | - |
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| (noun) the relation of opposition between things at right angles | Synonyms: orthogonal opposition, orthogonality |
| perpetration | (noun) the act of committing a crime | Synonyms: commission, committal |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| perpetuation | (noun) the act of prolonging something | Synonyms: lengthening, prolongation, protraction |
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| perpetuity | (noun) the property of being perpetual (seemingly ceaseless) | Synonyms: sempiternity |
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| perphenazine | (noun) tranquilizer and antidepressant (trade name Triavil) sometimes used as an antiemetic for adults | Synonyms: Triavil |
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| perplexity | (noun) trouble or confusion resulting from complexity | - |
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| superpatriotism | (noun) fanatical patriotism | Synonyms: chauvinism, jingoism, ultranationalism |
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| superphylum | (noun) (biology) a taxonomic group ranking between a phylum and below a class or subclass | - |
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| superposition | (noun) the placement of one thing on top of another | - |
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| (noun) (geometry) the placement of one object ideally in the position of another one in order to show that the two coincide | - |
| (noun) (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest | Synonyms: principle of superposition, superposition principle |
| (noun) (geology) the deposition of one geological stratum on another | - |
| superpower | (noun) a state powerful enough to influence events throughout the world | Synonyms: great power, major power, power, world power |
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