| poinciana | (noun) a tropical flowering shrub having bright orange or red flowers; sometimes placed in genus Poinciana | Synonyms: bird of paradise, Caesalpinia gilliesii, Poinciana gilliesii |
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| ramona | (noun) shrubby plant with aromatic greyish-green leaves used as a cooking herb | Synonyms: common sage, Salvia officinalis |
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| retina | (noun) the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve | - |
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| retsina | (noun) Greek wine flavored with resin | - |
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| sauna | (noun) a Finnish steam bath; steam is produced by pouring water over heated rocks | Synonyms: sweat room |
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| savanna | (noun) a flat grassland in tropical or subtropical regions | Synonyms: savannah |
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| scarlatina | (noun) an acute communicable disease (usually in children) characterized by fever and a red rash | Synonyms: scarlet fever |
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| semolina | (noun) milled product of durum wheat (or other hard wheat) used in pasta | - |
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| senna | (noun) any of various plants of the genus Senna having pinnately compound leaves and showy usually yellow flowers; many are used medicinally | - |
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| sienna | (noun) an earth color containing ferric oxides; used as a pigment | - |
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| signorina | (noun) an Italian courtesy title for an unmarried woman; equivalent to `Miss', it is either used alone or before a name | - |
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| sonatina | (noun) a short and simple sonata | - |
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| stamina | (noun) enduring strength and energy | Synonyms: staying power, toughness |
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| subpoena | (noun) a writ issued by court authority to compel the attendance of a witness at a judicial proceeding; disobedience may be punishable as a contempt of court | Synonyms: subpoena ad testificandum |
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| (verb) serve or summon with a subpoena | - |
| sultana | (noun) dried seedless grape | Synonyms: seedless raisin |
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| (noun) pale yellow seedless grape used for raisins and wine | - |
| tetrahymena | (noun) relative of the paramecium; often used in genetics research | - |
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| tramontana | (noun) a cold dry wind that blows south out of the mountains into Italy and the western Mediterranean | Synonyms: tramontane |
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| trichina | (noun) parasitic nematode occurring in the intestines of pigs and rats and human beings and producing larvae that form cysts in skeletal muscles | Synonyms: Trichinella spiralis |
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| tsarina | (noun) the wife or widow of a czar | Synonyms: czarina, czaritza, tsaritsa, tzarina |
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| tuna | (noun) any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters | Synonyms: tunny |
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| (noun) New Zealand eel | Synonyms: Anguilla sucklandii |
| (noun) important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks | Synonyms: tuna fish, tunny |
| (noun) tropical American prickly pear of Jamaica | Synonyms: Opuntia tuna |
| tzarina | (noun) the wife or widow of a czar | Synonyms: czarina, czaritza, tsarina, tsaritsa |
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| ulna | (noun) the inner and longer of the two bones of the human forearm | Synonyms: elbow bone |
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| vaccina | (noun) a local infection induced in humans by inoculation with the virus causing cowpox in order to confer resistance to smallpox; normally lasts three weeks and leaves a pitted scar | Synonyms: vaccinia, variola vaccina, variola vaccine, variola vaccinia |
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| vagina | (noun) the lower part of the female reproductive tract; a moist canal in female mammals extending from the labia minora to the uterus | - |
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| varna | (noun) (Hinduism) the name for the original social division of Vedic people into four groups (which are subdivided into thousands of jatis) | - |
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| vena | (noun) a blood vessel that carries blood from the capillaries toward the heart | Synonyms: vein, venous blood vessel |
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| verbena | (noun) any of numerous tropical or subtropical American plants of the genus Verbena grown for their showy spikes of variously colored flowers | Synonyms: vervain |
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| vicuna | (noun) small wild cud-chewing Andean animal similar to the guanaco but smaller; valued for its fleecy undercoat | Synonyms: Vicugna vicugna |
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| (noun) a soft wool fabric made from the fleece of the vicuna | - |
| (noun) the wool of the vicuna | - |
| zona | (noun) (anatomy) any encircling or beltlike structure | Synonyms: zone |
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