| palpebra | (noun) either of two folds of skin that can be moved to cover or open the eye | Synonyms: eyelid, lid |
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| para | (noun) a soldier in the paratroops | Synonyms: paratrooper |
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| (noun) 100 para equal 1 dinar in Yugoslavia | - |
| (noun) (obstetrics) the number of liveborn children a woman has delivered | Synonyms: parity |
| pellagra | (noun) a disease caused by deficiency of niacin or tryptophan (or by a defect in the metabolic conversion of tryptophan to niacin); characterized by gastrointestinal disturbances and erythema and nervous or mental disorders; may be caused by malnutrition or alcoholism or other nutritional impairments | Synonyms: Alpine scurvy, maidism, mal de la rosa, mal rosso, mayidism, Saint Ignatius' itch |
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| penumbra | (noun) a fringe region of partial shadow around an umbra | - |
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| plethora | (noun) extreme excess | Synonyms: embarrassment, overplus, superfluity |
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| pleura | (noun) the thin serous membrane around the lungs and inner walls of the chest | - |
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| primipara | (noun) (obstetrics) woman who has been delivered of a child for the first time | Synonyms: para I |
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| puerpera | (noun) a woman in childbirth or shortly thereafter | - |
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| purpura | (noun) any of several blood diseases causing subcutaneous bleeding | Synonyms: peliosis |
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| quadripara | (noun) (obstetrics) woman who has given birth to a viable infant in each of four pregnancies | - |
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| quintipara | (noun) (obstetrics) woman who has given birth to a viable infant in each of five pregnancies | - |
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| quira | (noun) any of several tropical American trees some yielding economically important timber | - |
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| (noun) hard heavy red wood of a quira tree | Synonyms: Panama redwood |
| rariora | (noun) (plural) rare collector's items | - |
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| remora | (noun) marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects | Synonyms: suckerfish, sucking fish |
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| sabra | (noun) a native-born Israeli | - |
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| samara | (noun) a winged often one-seed indehiscent fruit as of the ash or elm or maple | Synonyms: key, key fruit |
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| samsara | (noun) (Hinduism and Buddhism) the endless cycle of birth and suffering and death and rebirth | - |
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| sayonara | (noun) a farewell remark | Synonyms: adieu, adios, arrivederci, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, goodbye, so long |
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| sciara | (noun) minute blackish gregarious flies destructive to mushrooms and seedlings | Synonyms: fungus gnat, sciarid |
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| sclera | (noun) the whitish fibrous membrane (albuginea) that with the cornea forms the outer covering and protection of the eyeball | Synonyms: sclerotic coat |
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| scorzonera | (noun) long black salsify | Synonyms: black salsify |
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| (noun) perennial south European herb having narrow entire leaves and solitary yellow flower heads and long black edible roots shaped like carrots | Synonyms: black salsify, Scorzonera hispanica, viper's grass |
| shudra | (noun) the lowest of the four varnas: the servants and workers of low status | Synonyms: sudra |
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| sierra | (noun) a Spanish mackerel of western North America | Synonyms: Scomberomorus sierra |
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| (noun) a range of mountains (usually with jagged peaks and irregular outline) | - |
| signora | (noun) an Italian title of address equivalent to Mrs. when used before a name | - |
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| spirogyra | (noun) freshwater algae consisting of minute filaments containing spiral chlorophyll bands | - |
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| sudra | (noun) the lowest of the four varnas: the servants and workers of low status | Synonyms: shudra |
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| sura | (noun) the muscular back part of the shank | Synonyms: calf |
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| (noun) one of the sections (or chapters) in the Koran | - |
| sutra | (noun) a rule or aphorism in Sanskrit literature or a group of aphoristic doctrinal summaries prepared for memorization | - |
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| sutura | (noun) an immovable joint (especially between the bones of the skull) | Synonyms: fibrous joint, suture |
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| taira | (noun) long-tailed arboreal mustelid of Central America and South America | Synonyms: Eira barbara, tayra |
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| tantra | (noun) any of a fairly recent class of Hindu or Buddhist religious literature concerned with ritual acts of body and speech and mind | - |
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| tayra | (noun) long-tailed arboreal mustelid of Central America and South America | Synonyms: Eira barbara, taira |
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| tempera | (noun) pigment mixed with water-soluble glutinous materials such as size and egg yolk | Synonyms: poster color, poster colour, poster paint |
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| tempura | (noun) vegetables and seafood dipped in batter and deep-fried | - |
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| tessera | (noun) a small square tile of stone or glass used in making mosaics | - |
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| tetra | (noun) brightly colored tropical freshwater fishes | - |
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| tiara | (noun) a jeweled headdress worn by women on formal occasions | - |
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| totara | (noun) valuable timber tree of New Zealand yielding hard reddish wood used for furniture and bridges and wharves | Synonyms: Podocarpus totara |
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| tuatara | (noun) only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand | Synonyms: Sphenodon punctatum |
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| tundra | (noun) a vast treeless plain in the Arctic regions where the subsoil is permanently frozen | - |
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| umbra | (noun) a region of complete shadow resulting from total obstruction of light | - |
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| urethra | (noun) duct through which urine is discharged in most mammals and which serves as the male genital duct | - |
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| vara | (noun) a Spanish unit of length (about a yard) having different values in different localities | - |
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| vertebra | (noun) one of the bony segments of the spinal column | - |
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| vinifera | (noun) common European grape cultivated in many varieties; chief source of Old World wine and table grapes | Synonyms: common grape vine, vinifera grape, Vitis vinifera |
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| viscera | (noun) internal organs collectively (especially those in the abdominal cavity) | Synonyms: entrails, innards, insides |
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| zebra | (noun) any of several fleet black-and-white striped African equines | - |
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