| interferometer | (noun) any measuring instrument that uses interference patterns to make accurate measurements of waves | - |
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| interferon | (noun) an antiviral protein produced by cells that have been invaded by a virus; inhibits replication of the virus | - |
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| interoception | (noun) sensitivity to stimuli originating inside of the body | - |
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| interoceptor | (noun) any receptor that responds to stimuli inside the body | Synonyms: enteroceptor |
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| interoperability | (noun) (computer science) the ability to exchange and use information (usually in a large heterogeneous network made up of several local area networks) | - |
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| jeroboam | (noun) a large wine bottle (holds 4/5 of a gallon) | Synonyms: double-magnum |
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| kerosene | (noun) a flammable hydrocarbon oil used as fuel in lamps and heaters | Synonyms: coal oil, kerosine, lamp oil |
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| kerosine | (noun) a flammable hydrocarbon oil used as fuel in lamps and heaters | Synonyms: coal oil, kerosene, lamp oil |
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| ketosteroid | (noun) a steroid containing a ketone group | - |
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| lecherousness | (noun) a strong sexual desire | Synonyms: lust, lustfulness |
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| lepidopterologist | (noun) an entomologist who specializes in the collection and study of butterflies and moths | Synonyms: butterfly collector, lepidopterist |
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| lepidopterology | (noun) the branch of entomology dealing with Lepidoptera | Synonyms: lepidoptery |
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| lepidopteron | (noun) insect that in the adult state has four wings more or less covered with tiny scales | Synonyms: lepidopteran, lepidopterous insect |
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| lerot | (noun) dormouse of southern Europe and northern Africa | - |
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| medroxyprogesterone | (noun) a progestin compound (trade name Provera) used to treat menstrual disorders | Synonyms: Provera |
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| merobenthos | (noun) benthos consisting of organisms in pre-adult stages that later become adult in the plankton. | - |
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| meromelia | (noun) congenital absence of part of an arm or leg | - |
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| meronym | (noun) a word that names a part of a larger whole | Synonyms: part name |
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| meronymy | (noun) the semantic relation that holds between a part and the whole | Synonyms: part to whole relation |
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| merozoite | (noun) a cell that arises from the asexual division of a parent sporozoan during its life cycle | - |
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| methyltestosterone | (noun) an androgenic compound contained in drugs that are used to treat testosterone deficiency and female breast cancer and to stimulate growth and weight gain | - |
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| moneron | (noun) organisms that typically reproduce by asexual budding or fission and whose nutritional mode is absorption or photosynthesis or chemosynthesis | Synonyms: moneran |
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| murderousness | (noun) cruelty evidence by a capability to commit murder | - |
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| (noun) a bloodthirsty hatred arousing murderous impulses | - |
| mycosterol | (noun) a kind of sterol found in fungi. | - |
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| nephroangiosclerosis | (noun) kidney disease that is usually associated with hypertension; sclerosis of the renal arterioles reduces blood flow that can lead to kidney failure and heart failure | Synonyms: nephrosclerosis |
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| nephrosclerosis | (noun) kidney disease that is usually associated with hypertension; sclerosis of the renal arterioles reduces blood flow that can lead to kidney failure and heart failure | Synonyms: nephroangiosclerosis |
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| nerveroot | (noun) once common rose pink woodland orchid of eastern North America | Synonyms: Cypripedium acaule, moccasin flower |
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| neuropteron | (noun) insect having biting mouthparts and four large membranous wings with netlike veins | Synonyms: neuropteran, neuropterous insect |
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| nonsteroid | (noun) an organic compound that does no contain a steroid | Synonyms: nonsteroidal |
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| nonsteroidal | (noun) an organic compound that does no contain a steroid | Synonyms: nonsteroid |
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| novillero | (noun) a bullfighter who is required to fight bulls less than four years of age | - |
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| numerologist | (noun) a believer in numerology | - |
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| numerology | (noun) the study of the supposed occult influence of numbers on human affairs | - |
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| numerosity | (noun) a large number | Synonyms: multiplicity, numerousness |
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| numerousness | (noun) a large number | Synonyms: multiplicity, numerosity |
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| obstreperousness | (noun) noisy defiance | - |
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| offeror | (noun) someone who presents something to another for acceptance or rejection | Synonyms: offerer |
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| onerousness | (noun) unwelcome burdensome difficulty | Synonyms: burdensomeness, heaviness, oppressiveness |
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| operon | (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene | - |
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| operoseness | (noun) the quality of requiring extended effort | Synonyms: laboriousness, toilsomeness |
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| orthopteron | (noun) any of various insects having leathery forewings and membranous hind wings and chewing mouthparts | Synonyms: orthopteran, orthopterous insect |
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| osteosclerosis | (noun) abnormal hardening or eburnation of bone | - |
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| otosclerosis | (noun) hereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafness | - |
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| papooseroot | (noun) tall herb of eastern North America and Asia having blue berrylike fruit and a thick knotty rootstock formerly used medicinally | Synonyms: blue cohosh, blueberry root, Caulophyllum thalictrioides, Caulophyllum thalictroides, papoose root, squaw root, squawroot |
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| peperomia | (noun) any of various plants of the genus Peperomia; grown primarily for their often succulent foliage | - |
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| pepperoni | (noun) a pork and beef sausage (or a thin slice of this sausage) | - |
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| peroneus | (noun) muscle of the lower leg that is involved in moving the foot | - |
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| peroration | (noun) (rhetoric) the concluding section of an oration | - |
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| (noun) a flowery and highly rhetorical oration | - |
| peroxidase | (noun) any of a group of enzymes (occurring especially in plant cells) that catalyze the oxidation of a compound by a peroxide | - |
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| peroxide | (noun) a viscous liquid with strong oxidizing properties; a powerful bleaching agent; also used (in aqueous solutions) as a mild disinfectant and (in strong concentrations) as an oxidant in rocket fuels | Synonyms: hydrogen peroxide |
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| (noun) an inorganic compound containing the divalent ion -O-O- | - |
| phanerogam | (noun) plant that reproduces by means of seeds not spores | Synonyms: seed plant, spermatophyte |
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| phaneromania | (noun) an irresistible desire to pick at superficial body parts (as in obsessive nail-biting) | - |
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| pheromone | (noun) a chemical substance secreted externally by some animals (especially insects) that influences the physiology or behavior of other animals of the same species | - |
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| piperocaine | (noun) a compound used in the form of its hydrochloride as a local or spinal anesthetic | Synonyms: Metycaine, piperocaine hydrochloride |
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| ponderosa | (noun) common and widely distributed tall timber pine of western North America having dark green needles in bunches of 2 to 5 and thick bark with dark brown plates when mature | Synonyms: bull pine, Pinus ponderosa, ponderosa pine, western yellow pine |
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| ponderosity | (noun) the property of being large in mass | Synonyms: heft, heftiness, massiveness, ponderousness |
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| ponderousness | (noun) the property of being large in mass | Synonyms: heft, heftiness, massiveness, ponderosity |
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| (noun) an oppressive quality that is laborious and solemn and lacks grace or fluency | Synonyms: heaviness |
| prerogative | (noun) a right reserved exclusively by a particular person or group (especially a hereditary or official right) | Synonyms: exclusive right, perquisite, privilege |
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| profiterole | (noun) a small hollow pastry that is typically filled with cream and covered with chocolate | - |
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| progesterone | (noun) a steroid hormone (trade name Lipo-Lutin) produced in the ovary; prepares and maintains the uterus for pregnancy | Synonyms: Lipo-Lutin |
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| pterodactyl | (noun) extinct flying reptile | - |
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| pteropogon | (noun) southern Australian plant having feathery hairs surrounding the fruit | Synonyms: Pteropogon humboltianum |
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| pterosaur | (noun) an extinct reptile of the Jurassic and Cretaceous having a bird-like beak and membranous wings supported by the very long fourth digit of each forelimb | Synonyms: flying reptile |
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| rhinoceros | (noun) massive powerful herbivorous odd-toed ungulate of southeast Asia and Africa having very thick skin and one or two horns on the snout | Synonyms: rhino |
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| saleroom | (noun) an area where merchandise (such as cars) can be displayed | Synonyms: salesroom, showroom |
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| scleroderma | (noun) an autoimmune disease that affects the blood vessels and connective tissue; fibrous connective tissue is deposited in the skin | Synonyms: dermatosclerosis |
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| sclerometer | (noun) a measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point | - |
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| scleroprotein | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: albuminoid |
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| sclerosis | (noun) any pathological hardening or thickening of tissue | Synonyms: induration |
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| sclerotinia | (noun) any fungus of the genus Sclerotinia; some causing brown rot diseases in plants | - |
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| sclerotium | (noun) compact usually dark-colored mass of hardened mycelium constituting a vegetative food-storage body in various true fungi; detaches when mature and can give rise to new growth | - |
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| sclerotomy | (noun) surgical incision of the sclerotic coat of the eye | - |
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| serologist | (noun) a medical scientist who specializes in serology | - |
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| serology | (noun) the branch of medical science that deals with serums; especially with blood serums and disease | - |
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| serosa | (noun) a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid | Synonyms: serous membrane |
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| serotine | (noun) common brown bat of Europe | Synonyms: Eptesicus serotinus, European brown bat |
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| serotonin | (noun) a neurotransmitter involved in e.g. sleep and depression and memory | Synonyms: 5-hydroxytryptamine |
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| serow | (noun) short-horned dark-coated goat antelope of mountain areas of southern and southeastern Asia | - |
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| sideroblast | (noun) an erythroblast having granules of ferritin | - |
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| siderocyte | (noun) an abnormal red blood cell containing granules of iron not bound in hemoglobin | - |
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| sideropenia | (noun) a deficiency of iron; results from inadequate iron in the diet or from hemorrhage | - |
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| siderophilin | (noun) a globulin in blood plasma that carries iron | Synonyms: beta globulin, transferrin |
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| siderosis | (noun) fibrosis of the lung caused by iron dust; occurs among welders and other metal workers | - |
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| slanderousness | (noun) The property of being both untrue and harmful to a reputation. | - |
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| snakeroot | (noun) a plant of the genus Sanicula having palmately compound leaves and unisexual flowers in panicled umbels followed by bristly fruit; reputed to have healing powers | Synonyms: sanicle |
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| (noun) any of various North American plants of the genus Liatris having racemes or panicles of small discoid flower heads | Synonyms: blazing star, button snakeroot, gay-feather, gayfeather |
| sombrero | (noun) a straw hat with a tall crown and broad brim; worn in American southwest and in Mexico | - |
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| spherocyte | (noun) an abnormal spherical red blood cell | - |
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| spheroid | (noun) a shape that is generated by rotating an ellipse around one of its axes | Synonyms: ellipsoid of revolution |
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| spherometer | (noun) a measuring instrument for measuring the curvature of a surface | - |
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| stateroom | (noun) a guest cabin | - |
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| steroid | (noun) any of several fat-soluble organic compounds having as a basis 17 carbon atoms in four rings; many have important physiological effects | - |
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| (noun) any hormone affecting the development and growth of sex organs | Synonyms: sex hormone, steroid hormone |
| sterol | (noun) any of a group of natural steroid alcohols derived from plants or animals; they are waxy insoluble substances | Synonyms: steroid alcohol |
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| stilbesterol | (noun) synthetic nonsteroid with the properties of estrogen; formerly used to treat menstrual problems but was found to be associated with vaginal cancers in the daughters of women so treated during pregnancy | Synonyms: DES, diethylstilbesterol |
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| stoneroot | (noun) erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States | Synonyms: Collinsonia canadensis, horse balm, horseweed, richweed, stone-root, stone root |
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| storeroom | (noun) a room in which things are stored | Synonyms: storage room, stowage |
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| supererogation | (noun) an effort above and beyond the call of duty | - |
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| superorder | (noun) (biology) a taxonomic group ranking above an order and below a class or subclass | - |
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| superordinate | (noun) a word that is more generic than a given word | Synonyms: hypernym, superordinate word |
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| (noun) one of greater rank or station or quality | Synonyms: higher-up, superior |
| superordination | (noun) the semantic relation of being superordinate or belonging to a higher rank or class | Synonyms: hypernymy |
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| superoxide | (noun) the univalent anion O2- | Synonyms: superoxide anion |
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| (noun) a metallic oxide containing the univalent anion O2- | - |