| abecedarian | (noun) a novice learning the rudiments of some subject | - |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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| antiquarian | (noun) an expert or collector of antiquities | Synonyms: antiquary, archaist |
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| archosaurian | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
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| authoritarian | (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
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| barbarian | (noun) a member of an uncivilized people | Synonyms: savage |
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| (noun) a crude uncouth ill-bred person lacking culture or refinement | Synonyms: boor, churl, Goth, peasant, tike, tyke |
| caesarian | (noun) the delivery of a fetus by surgical incision through the abdominal wall and uterus (from the belief that Julius Caesar was born that way) | Synonyms: abdominal delivery, C-section, caesarean, caesarean delivery, caesarean section, caesarian delivery, caesarian section, cesarean, cesarean delivery, cesarean section, cesarian, cesarian section |
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| centenarian | (noun) someone who is at least 100 years old | - |
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| cesarian | (noun) the delivery of a fetus by surgical incision through the abdominal wall and uterus (from the belief that Julius Caesar was born that way) | Synonyms: abdominal delivery, C-section, caesarean, caesarean delivery, caesarean section, caesarian, caesarian delivery, caesarian section, cesarean, cesarean delivery, cesarean section, cesarian section |
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| cnidarian | (noun) radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms | Synonyms: coelenterate |
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| contrarian | (noun) an investor who deliberately decides to go against the prevailing wisdom of other investors | - |
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| cyprian | (noun) a woman who engages in sexual intercourse for money | Synonyms: bawd, cocotte, fancy woman, harlot, lady of pleasure, prostitute, sporting lady, tart, whore, woman of the street, working girl |
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| disciplinarian | (noun) someone who demands exact conformity to rules and forms | Synonyms: martinet, moralist |
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| durian | (noun) huge fruit native to southeastern Asia `smelling like Hell and tasting like Heaven'; seeds are roasted and eaten like nuts | - |
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| (noun) tree of southeastern Asia having edible oval fruit with a hard spiny rind | Synonyms: durian tree, Durio zibethinus, durion |
| egalitarian | (noun) a person who believes in the equality of all people | Synonyms: equalitarian |
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| equalitarian | (noun) a person who believes in the equality of all people | Synonyms: egalitarian |
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| equestrian | (noun) a person skilled in equitation | Synonyms: horseback rider |
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| eutherian | (noun) mammals having a placenta; all mammals except monotremes and marsupials | Synonyms: eutherian mammal, placental, placental mammal |
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| grammarian | (noun) a linguist who specializes in the study of grammar and syntax | Synonyms: syntactician |
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| historian | (noun) a person who is an authority on history and who studies it and writes about it | Synonyms: historiographer |
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| holothurian | (noun) echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders | Synonyms: sea cucumber |
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| humanitarian | (noun) someone devoted to the promotion of human welfare and to social reforms | Synonyms: do-gooder, improver |
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| (noun) an advocate of the principles of humanism; someone concerned with the interests and welfare of humans | Synonyms: humanist |
| infusorian | (noun) any member of the subclass Infusoria | - |
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| latitudinarian | (noun) a person who is broad-minded and tolerant (especially in standards of religious belief and conduct) | - |
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| libertarian | (noun) someone who believes the doctrine of free will | - |
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| (noun) an advocate of libertarianism | - |
| librarian | (noun) a professional person trained in library science and engaged in library services | Synonyms: bibliothec |
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| megatherian | (noun) a large extinct ground sloth | Synonyms: megatherian mammal, megatheriid |
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| metatherian | (noun) primitive pouched mammals found mainly in Australia and the Americas | - |
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| millenarian | (noun) a person who believes in the coming of the millennium (a time of great peace and prosperity) | Synonyms: chiliast, millenarist |
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| necessitarian | (noun) someone who does not believe the doctrine of free will | - |
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| nonagenarian | (noun) someone whose age is in the nineties | - |
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| octogenarian | (noun) someone whose age is in the eighties | - |
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| parliamentarian | (noun) an expert in parliamentary rules and procedures | - |
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| pedestrian | (noun) a person who travels by foot | Synonyms: footer, walker |
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| planarian | (noun) free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts | Synonyms: planaria |
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| platitudinarian | (noun) a bore who makes excessive use of platitudes | - |
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| predestinarian | (noun) anyone who submits to the belief that they are powerless to change their destiny | Synonyms: determinist, fatalist, predestinationist |
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| proletarian | (noun) a member of the working class (not necessarily employed) | Synonyms: prole, worker |
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| prototherian | (noun) primitive oviparous mammals found only in Australia and Tasmania and New Guinea | - |
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| radiolarian | (noun) protozoa with amoeba-like bodies and radiating filamentous pseudopods | - |
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| salutatorian | (noun) a graduating student with the second highest academic rank; may deliver the opening address at graduation exercises | Synonyms: salutatory speaker |
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| saurian | (noun) any of various reptiles of the suborder Sauria which includes lizards; in former classifications included also the crocodiles and dinosaurs | - |
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| sectarian | (noun) a member of a sect | Synonyms: sectarist, sectary |
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| seminarian | (noun) a student at a seminary (especially a Roman Catholic seminary) | Synonyms: seminarist |
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| septuagenarian | (noun) someone whose age is in the seventies | - |
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| sertularian | (noun) feathery colony of long-branched stems bearing stalkless paired polyps | - |
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| sexagenarian | (noun) someone whose age is in the sixties | - |
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| solitudinarian | (noun) one who lives in solitude | Synonyms: hermit, recluse, solitary, troglodyte |
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| tellurian | (noun) an inhabitant of the earth | Synonyms: earthling, earthman, worldling |
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| titanosaurian | (noun) amphibious quadrupedal herbivorous dinosaur with a long thin neck and whiplike tail; of the Cretaceous mostly in the Southern Hemisphere | Synonyms: titanosaur |
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| totalitarian | (noun) an adherent of totalitarian principles or totalitarian government | - |
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| utilitarian | (noun) someone who believes that the value of a thing depends on its utility | - |
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| valedictorian | (noun) the student with the best grades who usually delivers the valedictory address at commencement | Synonyms: valedictory speaker |
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| valerian | (noun) a plant of the genus Valeriana having lobed or dissected leaves and cymose white or pink flowers | - |
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| valetudinarian | (noun) weak or sickly person especially one morbidly concerned with his or her health | - |
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| vegetarian | (noun) eater of fruits and grains and nuts; someone who eats no meat or fish or (often) any animal products | - |
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| veterinarian | (noun) a doctor who practices veterinary medicine | Synonyms: vet, veterinary, veterinary surgeon |
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| vulgarian | (noun) a vulgar person (especially someone who makes a vulgar display of wealth) | - |
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