| paederast | (noun) a man who has sex (usually sodomy) with a boy as the passive partner | Synonyms: child molester, pederast |
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| paederasty | (noun) sexual relations between a man and a boy (usually anal intercourse with the boy as a passive partner) | Synonyms: pederasty |
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| paediatrician | (noun) a specialist in the care of babies | Synonyms: baby doctor, pediatrician, pediatrist |
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| paediatrics | (noun) the branch of medicine concerned with the treatment of infants and children | Synonyms: pediatric medicine, pediatrics, pedology |
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| paedophile | (noun) an adult who is sexually attracted to children | Synonyms: pedophile |
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| paedophilia | (noun) a sexual attraction to children | Synonyms: pedophilia |
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| paella | (noun) saffron-flavored dish made of rice with shellfish and chicken | - |
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| paeony | (noun) any of numerous plants widely cultivated for their showy single or double red or pink or white flowers | Synonyms: peony |
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| palaeencephalon | (noun) the more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex | Synonyms: paleencephalon, paleoencephalon |
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| palaeoanthropology | (noun) the scientific study of human fossils | Synonyms: human palaeontology, human paleontology, paleoanthropology |
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| palaeobiology | (noun) a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms | Synonyms: paleobiology |
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| palaeobotany | (noun) the study of fossil plants | Synonyms: paleobotany |
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| palaeoclimatology | (noun) the study of the climate of past ages | Synonyms: paleoclimatology |
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| palaeodendrology | (noun) the branch of paleobotany that studies fossil trees | Synonyms: paleodendrology |
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| palaeoecology | (noun) the branch of ecology that studies ancient ecology | Synonyms: paleoecology |
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| palaeoethnography | (noun) the ethnography of paleolithic humans | Synonyms: paleoethnography |
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| palaeogeography | (noun) the study of the geography of ancient times or ancient epochs | Synonyms: paleogeography |
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| palaeogeology | (noun) the study of geologic features once at the surface of the earth but now buried beneath rocks | Synonyms: paleogeology |
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| palaeology | (noun) the study of (especially prehistoric) antiquities | Synonyms: paleology |
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| palaeontologist | (noun) a specialist in paleontology | Synonyms: fossilist, paleontologist |
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| palaeontology | (noun) the earth science that studies fossil organisms and related remains | Synonyms: fossilology, paleontology |
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| palaeopathology | (noun) the study of disease of former times (as inferred from fossil evidence) | Synonyms: paleopathology |
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| palaeornithology | (noun) the paleobiology of birds | Synonyms: paleornithology |
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| palaeozoology | (noun) the study of fossil animals | Synonyms: paleozoology |
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| palaestra | (noun) a public place in ancient Greece or Rome devoted to the training of wrestlers and other athletes | Synonyms: palestra |
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| palaetiology | (noun) the explanation of past events in terms of scientific causes (as geological causes) | Synonyms: paletiology |
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| paraesthesia | (noun) abnormal skin sensations (as tingling or tickling or itching or burning) usually associated with peripheral nerve damage | Synonyms: paresthesia |
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| parasitaemia | (noun) a condition in which parasites are present in the blood | Synonyms: parasitemia |
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| pentaerythritol | (noun) a coronary vasodilator (trade name Peritrate) used to treat angina pectoris | Synonyms: Peritrate |
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| phaeochromocytoma | (noun) a vascular tumor of the adrenal gland; hypersecretion of epinephrine results in intermittent or sustained hypertension | Synonyms: pheochromocytoma |
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| phaeton | (noun) large open car seating four with folding top | Synonyms: tourer, touring car |
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| polychaete | (noun) chiefly marine annelids possessing both sexes and having paired appendages (parapodia) bearing bristles | Synonyms: polychaete worm, polychete, polychete worm |
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| praenomen | (noun) the first name of a citizen of ancient Rome | - |
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| praesidium | (noun) a permanent executive committee in socialist countries that has all the powers of some larger legislative body and that acts for it when it is not in session | Synonyms: presidium |
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| praetor | (noun) an annually elected magistrate of the ancient Roman Republic | Synonyms: pretor |
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| praetorium | (noun) the tent of an ancient Roman general | Synonyms: pretorium |
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| praetorship | (noun) the office of praetor | - |
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| propaedeutic | (noun) a course that provides an introduction to an art or science (or to more advanced study generally) | Synonyms: propaedeutics |
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| propaedeutics | (noun) a course that provides an introduction to an art or science (or to more advanced study generally) | Synonyms: propaedeutic |
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| protoarchaeology | (noun) the study of prehistoric human artifacts and human fossils | Synonyms: protoarcheology |
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| pyaemia | (noun) septicemia caused by pus-forming bacteria being released from an abscess | Synonyms: pyemia |
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| quaestor | (noun) any of several public officials of ancient Rome (usually in charge of finance and administration) | - |
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| raetam | (noun) desert shrub of Syria and Arabia having small white flowers; constitutes the juniper of the Old Testament; sometimes placed in genus Genista | Synonyms: Genista raetam, juniper, juniper bush, Retama raetam, retem |
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| reggae | (noun) popular music originating in the West Indies; repetitive bass riffs and regular chords played on the off beat by a guitar | - |
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| rensselaerite | (noun) a kind of soft talc; sometimes used as wood filler | - |
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| sapraemia | (noun) blood poisoning caused by putrefactive bacteria; results from eating putrefied matter | Synonyms: sapremia |
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| scarabaean | (noun) any of numerous species of stout-bodied beetles having heads with horny spikes | Synonyms: scarabaeid, scarabaeid beetle |
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| scarabaeid | (noun) any of numerous species of stout-bodied beetles having heads with horny spikes | Synonyms: scarabaean, scarabaeid beetle |
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| scarabaeus | (noun) scarabaeid beetle considered divine by ancient Egyptians | Synonyms: scarab, Scarabaeus sacer |
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| sciaenid | (noun) widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound | Synonyms: sciaenid fish |
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| scorpaenid | (noun) any of numerous carnivorous usually bottom-dwelling warm-water marine fishes found worldwide but most abundant in the Pacific | Synonyms: scorpaenid fish |
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| scorpaenoid | (noun) fishes having the head armored with bony plates | Synonyms: scorpaenoid fish |
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| septicaemia | (noun) invasion of the bloodstream by virulent microorganisms from a focus of infection | Synonyms: blood poisoning, septicemia |
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| somaesthesia | (noun) the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs | Synonyms: somaesthesis, somataesthesis, somatesthesia, somatic sense, somatic sensory system, somatosensory system, somesthesia, somesthesis |
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| (noun) the perception of tactual or proprioceptive or gut sensations | Synonyms: somatesthesia, somatic sensation, somesthesia |
| somaesthesis | (noun) the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs | Synonyms: somaesthesia, somataesthesis, somatesthesia, somatic sense, somatic sensory system, somatosensory system, somesthesia, somesthesis |
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| somataesthesis | (noun) the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs | Synonyms: somaesthesia, somaesthesis, somatesthesia, somatic sense, somatic sensory system, somatosensory system, somesthesia, somesthesis |
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| spelaeologist | (noun) a person who explores caves | Synonyms: potholer, speleologist, spelunker |
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| spelaeology | (noun) the pastime of exploring caves | Synonyms: speleology |
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| (noun) the scientific study of caves | Synonyms: speleology |
| spiraea | (noun) any rosaceous plant of the genus Spiraea; has sprays of small white or pink flowers | Synonyms: spirea |
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| (noun) a Japanese shrub that resembles members of the genus Spiraea; widely cultivated in many varieties for its dense panicles of flowers in many colors; often forced by florists for Easter blooming | Synonyms: Astilbe japonica, spirea |
| spirochaete | (noun) parasitic or free-living bacteria; many pathogenic to humans and other animals | Synonyms: spirochete |
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| sunbae | (noun) a female referring to an older male | - |
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| sundae | (noun) ice cream served with a topping | Synonyms: ice-cream sundae |
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| synaeresis | (noun) the separation of liquid from a gel that is caused by contraction (as in cheese making) | Synonyms: syneresis |
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| (noun) the contraction of two vowels into a diphthong | Synonyms: syneresis |
| synaesthesia | (noun) a sensation that normally occurs in one sense modality occurs when another modality is stimulated | Synonyms: synesthesia |
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| taekwondo | (noun) a Korean martial art similar to karate | Synonyms: tae kwon do |
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| tael | (noun) a unit of weight used in east Asia approximately equal to 1.3 ounces | - |
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| taenia | (noun) tapeworms parasitic in humans which uses the pig as its intermediate host | - |
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| (noun) a narrow headband or strip of ribbon worn as a headband | Synonyms: fillet, tenia |
| thalassaemia | (noun) an inherited form of anemia caused by faulty synthesis of hemoglobin | Synonyms: Mediterranean anaemia, Mediterranean anemia, thalassemia |
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| toxaemia | (noun) blood poisoning caused by bacterial toxic substances in the blood | Synonyms: toxemia |
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| (noun) an abnormal condition of pregnancy characterized by hypertension and edema and protein in the urine | Synonyms: toxaemia of pregnancy, toxemia, toxemia of pregnancy |
| tularaemia | (noun) a highly infectious disease of rodents (especially rabbits and squirrels) and sometimes transmitted to humans by ticks or flies or by handling infected animals | Synonyms: deer fly fever, rabbit fever, tularemia, yatobyo |
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| turreae | (noun) any of numerous trees and shrubs grown for their beautiful glossy foliage and sweetly fragrant starry flowers | - |
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| uraemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotaemia, azotemia, uremia |
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| viraemia | (noun) the presence of a virus in the blood stream | Synonyms: viremia |
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