| asterion | (noun) the craniometric point at the junction of the lamboid suture and the occipitomastoid suture and the parietomastoid suture | - |
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| briony | (noun) a vine of the genus Bryonia having large leaves and small flowers and yielding acrid juice with emetic and purgative properties | Synonyms: bryony |
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| carrion | (noun) the dead and rotting body of an animal; unfit for human food | - |
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| centurion | (noun) (ancient Rome) the leader of 100 soldiers | - |
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| chorion | (noun) the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) | - |
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| chorionic | (adjective) of or relating to a chorion | - |
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| clarion | (adjective) loud and clear | - |
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| (noun) a medieval brass instrument with a clear shrill tone | - |
| (verb) proclaim on, or as if on, a clarion | - |
| (verb) blow the clarion | - |
| criterion | (noun) the ideal in terms of which something can be judged | Synonyms: standard |
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| (noun) a basis for comparison; a reference point against which other things can be evaluated | Synonyms: measure, standard, touchstone |
| criterional | (adjective) serving as a basis for evaluation | Synonyms: criterial |
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| durion | (noun) tree of southeastern Asia having edible oval fruit with a hard spiny rind | Synonyms: durian, durian tree, Durio zibethinus |
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| histrion | (noun) a theatrical performer | Synonyms: actor, player, role player, thespian |
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| histrionic | (adjective) characteristic of acting or a stage performance; often affected | Synonyms: melodramatic |
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| histrionics | (noun) a performance of a play | Synonyms: representation, theatrical, theatrical performance |
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| (noun) a deliberate display of emotion for effect | - |
| kerion | (noun) ringworm infection of the hair follicles of the scalp and beard that usually results in a swelling that is covered with pustules and oozes fluid | - |
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| marionette | (noun) a small figure of a person operated from above with strings by a puppeteer | Synonyms: puppet |
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| mitochondrion | (noun) an organelle containing enzymes responsible for producing energy | Synonyms: chondriosome |
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| morion | (noun) a metal helmet worn by common soldiers in the 16th century | Synonyms: cabasset |
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| prion | (noun) (microbiology) an infectious protein particle similar to a virus but lacking nucleic acid; thought to be the agent responsible for scrapie and other degenerative diseases of the nervous system | - |
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| proprionamide | (noun) the amide of propionic acid (C2H5CONH2) | Synonyms: propanamide |
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| pterion | (noun) the craniometric point in the region of the sphenoid fontanelle | - |
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| septrional | (adjective) of northern regions; from the seven stars (or seven plowing oxen) of Ursa Major | - |
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| tenebrionid | (noun) sluggish hard-bodied black terrestrial weevil whose larvae feed on e.g. decaying plant material or grain | Synonyms: darkling beetle, darkling groung beetle |
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| vibrion | (noun) curved rodlike motile bacterium | Synonyms: vibrio |
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| vibrionic | (adjective) caused by bacteria of the genus Vibrio | - |
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| virion | (noun) (virology) a complete viral particle; nucleic acid and capsid (and a lipid envelope in some viruses) | - |
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