| thyreophoran | (noun) armored dinosaurs: stegosaurs and ankylosaurs | Synonyms: suborder Thyreophora, Thyreophora |
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| transphobic | (adjective) Prejudiced against transgender people | - |
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| traumatophobia | (noun) a morbid fear of battle or physical injury | - |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| triskaidekaphobia | (noun) a morbid fear of the number 13 | - |
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| triskaidekaphobic | (adjective) suffering from triskaidekaphobia (abnormal fear of the number 13) | - |
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| trophobiosis | (noun) a symbiotic relation in which one organism protects the other in return for some kind of food product | - |
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| trophoblast | (noun) the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall | - |
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| trophoblastic | (adjective) of or relating to the trophoblast | - |
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| trophotropic | (adjective) of or relating to trophotropism | - |
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| trophotropism | (noun) an orienting response to food | - |
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| trophozoite | (noun) a sporozoan in the active feeding stage of its life cycle | - |
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| typhoid | (noun) serious infection marked by intestinal inflammation and ulceration; caused by Salmonella typhosa ingested with food or water | Synonyms: enteric fever, typhoid fever |
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| typhoon | (noun) a tropical cyclone occurring in the western Pacific or Indian oceans | - |
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| uncamphorated | (adjective) not containing camphor | - |
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| uphold | (verb) stand up for; stick up for; of causes, principles, or ideals | - |
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| (verb) support against an opponent | Synonyms: maintain |
| (verb) keep or maintain in unaltered condition; cause to remain or last | Synonyms: bear on, carry on, continue, preserve |
| upholder | (noun) someone who upholds or maintains | Synonyms: maintainer, sustainer |
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| upholster | (verb) provide furniture with padding, springs, webbing, and covers | - |
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| upholsterer | (noun) a craftsman who upholsters furniture | - |
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| upholstery | (noun) the craft of upholstering | - |
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| (noun) covering (padding and springs and webbing and fabric) on a piece of furniture | - |
| vibraphone | (noun) a percussion instrument similar to a xylophone but having metal bars and rotating disks in the resonators that produce a vibrato sound | Synonyms: vibes, vibraharp |
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| vibraphonist | (noun) a musician who plays the vibraphone | Synonyms: vibist |
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| xenophobia | (noun) a fear of foreigners or strangers | - |
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| xenophobic | (adjective) suffering from xenophobia; having abnormal fear or hatred of the strange or foreign | - |
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| xylophone | (noun) a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets | Synonyms: marimba |
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| xylophonist | (noun) someone who plays a xylophone | - |
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| zoophobia | (noun) a morbid fear of animals | - |
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| zygomorphous | (adjective) capable of division into symmetrical halves by only one longitudinal plane passing through the axis | Synonyms: bilaterally symmetrical, zygomorphic |
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