| picornavirus | (noun) a group of single-strand RNA viruses with a protein coat | - |
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| pileus | (noun) a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom | Synonyms: cap |
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| pilus | (noun) hairlike structure especially on the surface of a cell or microorganism | - |
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| (noun) any of the cylindrical filaments characteristically growing from the epidermis of a mammal | Synonyms: hair |
| pisanosaurus | (noun) primitive dinosaur found in Argentina | Synonyms: pisanosaur |
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| platypus | (noun) small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae | Synonyms: duck-billed platypus, duckbill, duckbilled platypus, Ornithorhynchus anatinus |
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| plectranthus | (noun) any of various ornamental plants of the genus Plectranthus | - |
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| plesiosaurus | (noun) extinct marine reptile with a small head on a long neck and a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous | Synonyms: plesiosaur |
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| plexus | (noun) a network of intersecting blood vessels or intersecting nerves or intersecting lymph vessels | Synonyms: rete |
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| plus | (noun) the arithmetic operation of summing; calculating the sum of two or more numbers | Synonyms: addition, summation |
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| (noun) a useful or valuable quality | Synonyms: asset |
| pneumococcus | (noun) bacterium causing pneumonia in mice and humans | Synonyms: Diplococcus pneumoniae |
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| poliovirus | (noun) the virus causing poliomyelitis | - |
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| polyanthus | (noun) florists' primroses; considered a complex hybrid derived from oxlip, cowslip, and common primrose | Synonyms: Primula polyantha |
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| polypus | (noun) a small vascular growth on the surface of a mucous membrane | Synonyms: polyp |
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| poxvirus | (noun) any of a group of viruses that can cause pox diseases in vertebrates | - |
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| precalculus | (noun) a college-level algebra and trigonometry course that is designed to prepare students for the study of calculus | Synonyms: precalc |
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| primus | (noun) the presiding bishop of the Episcopal Church of Scotland | - |
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| prolapsus | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: descensus, prolapse |
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| pronucleus | (noun) the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote | - |
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| propositus | (noun) the person immediately affected by or concerned with an action | - |
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| prospectus | (noun) a catalog listing the courses offered by a college or university | Synonyms: course catalog, course catalogue |
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| (noun) a formal written offer to sell securities (filed with the SEC) that sets forth a plan for a (proposed) business enterprise | - |
| protohippus | (noun) Pliocene horse approaching donkeys in size | - |
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| provirus | (noun) cDNA copy of the RNA genome of a retrovirus; the genetic material of a virus as incorporated into and able to replicate with the genome of a host cell | - |
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| pruritus | (noun) an intense itching sensation that can have various causes (as by allergies or infection or lymphoma or jaundice etc.) | - |
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| psittacosaurus | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaur |
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| pus | (noun) a fluid product of inflammation | Synonyms: festering, ichor, purulence, sanies, suppuration |
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| pylorus | (noun) a small circular opening between the stomach and the duodenum | - |
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| quietus | (noun) euphemisms for death (based on an analogy between lying in a bed and in a tomb) | Synonyms: eternal rest, eternal sleep, rest, sleep |
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| radius | (noun) support consisting of a radial member of a wheel joining the hub to the rim | Synonyms: spoke, wheel spoke |
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| (noun) the length of a line segment between the center and circumference of a circle or sphere | Synonyms: r |
| (noun) the outer and slightly shorter of the two bones of the human forearm | - |
| (noun) a circular region whose area is indicated by the length of its radius | - |
| (noun) a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere) | - |
| ramus | (noun) the posterior part of the mandible that is more or less vertical | - |
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| raptus | (noun) a state of being carried away by overwhelming emotion | Synonyms: ecstasy, exaltation, rapture, transport |
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| (noun) a sudden occurrence (or recurrence) of a disease | Synonyms: ictus, seizure |
| rebus | (noun) a puzzle where you decode a message consisting of pictures representing syllables and words | - |
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| rectus | (noun) any of various straight muscles | - |
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| religious | (noun) a member of a religious order who is bound by vows of poverty and chastity and obedience | - |
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| rendezvous | (noun) a meeting planned at a certain time and place | - |
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| (noun) a date; usually with a member of the opposite sex | Synonyms: tryst |
| (noun) a place where people meet | - |
| reovirus | (noun) any of a group of non-arboviruses including the rotavirus causing infant enteritis | - |
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| retrovirus | (noun) any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell | - |
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| rhabdovirus | (noun) any of a group of arboviruses including those causing rabies | - |
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| rhesus | (noun) of southern Asia; used in medical research | Synonyms: Macaca mulatta, rhesus monkey |
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| rhinovirus | (noun) any of a group of picornaviruses that are responsible for many upper respiratory infections | - |
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| rhizopus | (noun) any of various rot causing fungi of the genus Rhizopus | - |
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| rhombus | (noun) a parallelogram with four equal sides; an oblique-angled equilateral parallelogram | Synonyms: diamond, rhomb |
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| rhonchus | (noun) a sound like whistling or snoring that is heard with a stethoscope during expiration as air passes through obstructed channels | - |
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| rictus | (noun) a gaping grimace | - |
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| rivulus | (noun) found in small streams of tropical America; often kept in aquariums; usually hermaphroditic | - |
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| rotavirus | (noun) the reovirus causing infant enteritis | - |
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| ruckus | (noun) the act of making a noisy disturbance | Synonyms: commotion, din, ruction, rumpus, tumult |
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| rudapithecus | (noun) fossil hominoids from northern central Hungary; late Miocene | Synonyms: Dryopithecus Rudapithecus hungaricus |
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| rumpus | (noun) the act of making a noisy disturbance | Synonyms: commotion, din, ruckus, ruction, tumult |
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| sacculus | (noun) a small sac or pouch (especially the smaller chamber of the membranous labyrinth) | Synonyms: saccule |
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| saleratus | (noun) a white soluble compound (NaHCO3) used in effervescent drinks and in baking powders and as an antacid | Synonyms: baking soda, bicarbonate of soda, sodium bicarbonate, sodium hydrogen carbonate |
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| sarcophagus | (noun) a stone coffin (usually bearing sculpture or inscriptions) | - |
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| sardius | (noun) a deep orange-red variety of chalcedony | Synonyms: sard, sardine |
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| sartorius | (noun) a muscle in the thigh that helps to rotate the leg into the sitting position assumed by a tailor; the longest muscle in the human body | Synonyms: musculus sartorius, sartorius muscle |
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| scabious | (noun) any of various plants of the genus Scabiosa | Synonyms: scabiosa |
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| scalenus | (noun) any of four pairs of muscles extending from the cervical vertebrae to the second rib; involved in moving the neck and in breathing | Synonyms: musculus scalenus, scalene muscle |
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| scarabaeus | (noun) scarabaeid beetle considered divine by ancient Egyptians | Synonyms: scarab, Scarabaeus sacer |
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| schizanthus | (noun) any plant of the genus Schizanthus having finely divided leaves and showy variegated flowers | Synonyms: butterfly flower, poor man's orchid |
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| scorbutus | (noun) a condition caused by deficiency of ascorbic acid (vitamin C) | Synonyms: scurvy |
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| scyphus | (noun) an ancient Greek drinking cup; two handles and footed base | - |
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| serratus | (noun) any of several muscles of the trunk | Synonyms: serratus muscles |
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| shamus | (noun) someone who can be employed as a detective to collect information and assist in criminal investigations | Synonyms: operative, PI, private detective, private eye, private investigator, sherlock |
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| silenus | (noun) any of the minor woodland deities who were companions of Dionysus (similar to the satyrs) | - |
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| singultus | (noun) (usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible sound; sometimes a symptom of indigestion | Synonyms: hiccough, hiccup |
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| sinus | (noun) a wide channel containing blood; does not have the coating of an ordinary blood vessel | Synonyms: venous sinus |
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| (noun) any of various air-filled cavities especially in the bones of the skull | - |
| (noun) an abnormal passage leading from a suppurating cavity to the body surface | Synonyms: fistula |
| soleus | (noun) a broad flat muscle in the calf of the leg under the gastrocnemius muscle | Synonyms: soleus muscle |
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| solidus | (noun) a punctuation mark (/) used to separate related items of information | Synonyms: diagonal, separatrix, slash, stroke, virgule |
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| (noun) a gold coin of the Byzantine Empire; widely circulated in Europe in the Middle Ages | Synonyms: bezant, bezzant, byzant |
| sorus | (noun) cluster of sporangia usually on underside of a fern frond | - |
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| (noun) a spore-producing structure in certain lichens and fungi | - |
| sphacelus | (noun) the localized death of living cells (as from infection or the interruption of blood supply) | Synonyms: gangrene, mortification, necrosis |
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| (noun) necrotic tissue; a mortified or gangrenous part or mass | Synonyms: gangrene, slough |
| splenius | (noun) either of two flat muscles that extend from the upper vertebrae to the base of the skull and serve to rotate or flex or extend the head and neck | Synonyms: splenius muscle |
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| staphylococcus | (noun) spherical Gram-positive parasitic bacteria that tend to form irregular colonies; some cause boils or septicemia or infections | Synonyms: staph, staphylococci |
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| status | (noun) the relative position or standing of things or especially persons in a society | Synonyms: position |
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| (noun) a state at a particular time | Synonyms: condition |
| staurikosaurus | (noun) primitive dinosaur found in Brazil | Synonyms: staurikosaur |
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| stegosaurus | (noun) herbivorous ornithischian dinosaur with a row of bony plates along its back and a spiked tail probably used as a weapon | Synonyms: stegosaur, Stegosaur stenops |
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| stenopterygius | (noun) an ichthyosaur of the genus Stenopterygius | Synonyms: Stenopterygius quadrisicissus |
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| stimulus | (noun) any stimulating information or event; acts to arouse action | Synonyms: input, stimulant, stimulation |
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| strabismus | (noun) abnormal alignment of one or both eyes | Synonyms: squint |
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| stratus | (noun) a large dark low cloud | Synonyms: stratus cloud |
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| streptobacillus | (noun) any of various rod-shaped Gram-negative bacteria | - |
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| streptocarpus | (noun) any of various plants of the genus Streptocarpus having leaves in a basal rosette and flowers like primroses | - |
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| streptococcus | (noun) spherical Gram-positive bacteria occurring in pairs or chains; cause e.g. scarlet fever and tonsillitis | Synonyms: strep, streptococci |
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| strobilus | (noun) cone-shaped mass of ovule- or spore-bearing scales or bracts | Synonyms: cone, strobile |
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| strophanthus | (noun) any of various shrubs or small trees of the genus Strophanthus having whorled leaves and showy flowers of various colors in dense and corymbose clusters; some have poisonous seeds | - |
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| struthiomimus | (noun) small light-boned toothless dinosaur resembling an ostrich in size and proportions | - |
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| stylus | (noun) a pointed tool for writing or drawing or engraving | Synonyms: style |
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| (noun) a sharp pointed device attached to the cartridge of a record player | - |
| styracosaurus | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaur |
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| subconscious | (noun) psychic activity just below the level of awareness | Synonyms: subconscious mind |
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| subgenus | (noun) (biology) taxonomic group between a genus and a species | - |
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| subthalamus | (noun) the ventral part of the thalamus | - |
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| succubus | (noun) a female demon believed to have sexual intercourse with sleeping men | Synonyms: succuba |
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| succus | (noun) any of several liquids of the body | Synonyms: juice |
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| sulcus | (noun) (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain | - |
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| sumpsimus | (noun) a correct expression that takes the place of a popular but incorrect expression | - |
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| surplus | (noun) a quantity much larger than is needed | Synonyms: excess, nimiety, surplusage |
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| susurrus | (noun) the indistinct sound of people whispering | Synonyms: susurration |
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| syllabus | (noun) an integrated course of academic studies | Synonyms: course of study, curriculum, program, programme |
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| talus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, astragalus |
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| (noun) a sloping mass of loose rocks at the base of a cliff | Synonyms: scree |
| tarsus | (noun) the part of the foot of a vertebrate between the metatarsus and the leg; in human beings the bones of the ankle and heel collectively | - |
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| tenesmus | (noun) painful spasm of the anal sphincter along with an urgent desire to defecate without the significant production of feces; associated with irritable bowel syndrome | - |
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| terminus | (noun) either end of a railroad or bus route | - |
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| (noun) station where transport vehicles load or unload passengers or goods | Synonyms: depot, terminal |
| (noun) (architecture) a statue or a human bust or an animal carved out of the top of a square pillar; originally used as a boundary marker in ancient Rome | Synonyms: term, terminal figure |
| (noun) the ultimate goal for which something is done | Synonyms: destination |
| (noun) a place where something ends or is complete | Synonyms: end point, endpoint, termination |
| tetanus | (noun) a sustained muscular contraction resulting from a rapid series of nerve impulses | - |
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| (noun) an acute and serious infection of the central nervous system caused by bacterial infection of open wounds; spasms of the jaw and laryngeal muscles may occur during the late stages | Synonyms: lockjaw |