| spongioblastoma | (noun) a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal | Synonyms: glioblastoma |
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| squama | (noun) a protective structure resembling a scale | - |
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| steatocystoma | (noun) a common cyst of the skin; filled with fatty matter (sebum) that is secreted by a sebaceous gland that has been blocked | Synonyms: pilar cyst, sebaceous cyst, wen |
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| stemma | (noun) an eye having a single lens | Synonyms: ocellus, simple eye |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, pedigree, stock |
| (noun) a tree diagram showing a reconstruction of the transmission of manuscripts of a literary work | - |
| stigma | (noun) a skin lesion that is a diagnostic sign of some disease | - |
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| (noun) an external tracheal aperture in a terrestrial arthropod | - |
| (noun) a symbol of disgrace or infamy | Synonyms: brand, mark, stain |
| (noun) the apical end of the style where deposited pollen enters the pistil | - |
| stoma | (noun) a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ) | - |
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| (noun) a minute epidermal pore in a leaf or stem through which gases and water vapor can pass | Synonyms: pore, stomate |
| stroma | (noun) the supporting tissue of an organ (as opposed to parenchyma) | - |
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| (noun) the dense colorless framework of a chloroplast | - |
| (noun) a mass of fungal tissue that has spore-bearing structures embedded in it or on it | - |
| struma | (noun) abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the diet | Synonyms: goiter, goitre, thyromegaly |
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| (noun) a form of tuberculosis characterized by swellings of the lymphatic glands | Synonyms: king's evil, scrofula |
| syntagma | (noun) a syntactic string of words that forms a part of some larger syntactic unit | Synonyms: syntagm |
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| teratoma | (noun) a tumor consisting of a mixture of tissues not normally found at that site | - |
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| trachoma | (noun) a chronic contagious disease caused by a bacterium and marked by inflammation of the conjunctiva and cornea of the eye and the formation of scar tissue | - |
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| trauma | (noun) an emotional wound or shock often having long-lasting effects | Synonyms: psychic trauma |
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| (noun) any physical damage to the body caused by violence or accident or fracture etc.; the condition of an injury | Synonyms: harm, hurt, injury |
| treponema | (noun) spirochete that causes disease in humans (e.g. syphilis and yaws) | - |
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| tritoma | (noun) a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers | Synonyms: flame-flower, flame flower, flameflower, kniphofia |
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| ulama | (noun) the body of Mullahs (Muslim scholars trained in Islam and Islamic law) who are the interpreters of Islam's sciences and doctrines and laws and the chief guarantors of continuity in the spiritual and intellectual history of the Islamic community | Synonyms: ulema |
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| ulema | (noun) the body of Mullahs (Muslim scholars trained in Islam and Islamic law) who are the interpreters of Islam's sciences and doctrines and laws and the chief guarantors of continuity in the spiritual and intellectual history of the Islamic community | Synonyms: ulama |
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| ultima | (noun) the last syllable in a word | - |
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| villoma | (noun) a benign epithelial tumor forming a rounded mass | Synonyms: papillary tumor, papillary tumour, papilloma |
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| xanthelasma | (noun) xanthoma of the eyelids; occurs chiefly in the elderly | - |
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| xanthoma | (noun) a skin problem marked by the development (on the eyelids and neck and back) of irregular yellow nodules; sometimes attributable to disturbances of cholesterol metabolism | - |
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| xeroderma | (noun) a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin | Synonyms: xerodermia |
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| xeroma | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xerophthalmia, xerophthalmus |
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| xylosma | (noun) shrub or small tree grown as an ornamental in mild climates for its neat evergreen foliage and fragrant late flowers; native of China | Synonyms: Xylosma congestum |
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| zeugma | (noun) use of a verb with two or more complements, playing on the verb's polysemy, for humorous effect | - |
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| zygoma | (noun) the slender arch formed by the temporal process of the cheekbone that bridges to the zygomatic process of the temporal bone | Synonyms: arcus zygomaticus, zygomatic arch |
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