| apocalypse | (noun) a cosmic cataclysm in which God destroys the ruling powers of evil | - |
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| apse | (noun) a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar | Synonyms: apsis |
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| collapse | (noun) the act of throwing yourself down; collapse; sink | Synonyms: flop |
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| (noun) a natural event caused by something suddenly falling down or caving in | - |
| (noun) a sudden large decline of business or the prices of stocks (especially one that causes additional failures) | Synonyms: crash |
| (noun) an abrupt failure of function or complete physical exhaustion | Synonyms: prostration |
| copse | (noun) a dense growth of bushes | Synonyms: brush, brushwood, coppice, thicket |
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| corpse | (noun) the dead body of a human being | Synonyms: cadaver, clay, remains, stiff |
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| dropseed | (noun) a grass of the genus Sporobolus | Synonyms: drop-seed |
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| eclipse | (noun) one celestial body obscures another | Synonyms: occultation |
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| ellipse | (noun) a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it | Synonyms: oval |
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| glimpse | (noun) a quick look | Synonyms: coup d'oeil, glance |
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| (noun) a brief or incomplete view | - |
| (noun) a vague indication | - |
| hydroisohypse | (noun) a line on a map connecting points of equal level on the piezometric surface. | - |
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| ipsedixitism | (noun) an unsupported dogmatic assertion | Synonyms: ipse dixit |
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| lapse | (noun) a mistake resulting from inattention | Synonyms: oversight |
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| (noun) a failure to maintain a higher state | Synonyms: backsliding, lapsing, relapse, relapsing, reversion, reverting |
| (noun) a break or intermission in the occurrence of something | - |
| palimpsest | (noun) a manuscript (usually written on papyrus or parchment) on which more than one text has been written with the earlier writing incompletely erased and still visible | - |
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| prolapse | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: descensus, prolapsus |
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| psephologist | (noun) a sociologist who studies election trends | - |
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| psephology | (noun) the branch of sociology that studies election trends (as by opinion polls) | - |
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| pseud | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseudo, role player, sham, shammer |
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| pseudo | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseud, role player, sham, shammer |
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| pseudobulb | (noun) a solid bulblike enlargement of the stem of some orchids | - |
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| pseudocarp | (noun) fruit containing much fleshy tissue besides that of the ripened ovary; as apple or strawberry | Synonyms: accessory fruit |
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| pseudocyesis | (noun) physiological state in which a woman exhibits symptoms of pregnancy but is not pregnant | Synonyms: false pregnancy |
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| pseudoephedrine | (noun) poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it | - |
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| pseudohallucination | (noun) an image vivid enough to be a hallucination but recognized as unreal | - |
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| pseudohermaphrodite | (noun) someone having external genitalia of one sex and internal sex organs of the other sex; not a true hermaphrodite because there is no ambiguity in the sex of the external genitalia and hence no question about gender at birth | - |
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| pseudohermaphroditism | (noun) congenital condition in which a person has external genitalia of one sex and internal sex organs of the other sex | - |
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| pseudomonad | (noun) bacteria usually producing greenish fluorescent water-soluble pigment; some pathogenic for plants and animals | - |
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| pseudonym | (noun) a fictitious name used when the person performs a particular social role | Synonyms: anonym, nom de guerre |
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| pseudophloem | (noun) false phloem | - |
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| pseudopod | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopodium |
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| pseudopodium | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopod |
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| pseudorubella | (noun) a viral disease of infants and young children; characterized by abrupt high fever and mild sore throat; a few days later there is a faint pinkish rash that lasts for a few hours to a few days | Synonyms: exanthema subitum, roseola infantilis, roseola infantum |
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| pseudoscience | (noun) an activity resembling science but based on fallacious assumptions | - |
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| pseudoscorpion | (noun) small nonvenomous arachnid resembling a tailless scorpion | Synonyms: false scorpion |
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| pseudosmallpox | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| pseudovariola | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudosmallpox, variola minor, West Indian smallpox, white pox |
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| relapse | (noun) a failure to maintain a higher state | Synonyms: backsliding, lapse, lapsing, relapsing, reversion, reverting |
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| slopseller | (noun) a dealer in cheap ready-made clothing | Synonyms: slop-seller |
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| synapse | (noun) the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle | - |
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| upset | (noun) an improbable and unexpected victory | Synonyms: overturn |
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| (noun) the act of disturbing the mind or body | Synonyms: derangement, overthrow |
| (noun) the act of upsetting something | Synonyms: overturn, turnover |
| (noun) a tool used to thicken or spread metal (the end of a bar or a rivet etc.) by forging or hammering or swaging | Synonyms: swage |
| (noun) an unhappy and worried mental state | Synonyms: disturbance, perturbation |
| (noun) a physical condition in which there is a disturbance of normal functioning | Synonyms: disorder |
| upsetter | (noun) an unexpected winner; someone who defeats the favorite competitor | - |
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