| ichthyosaurus | (noun) ichthyosaurs of the Jurassic | - |
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| icterus | (noun) yellowing of the skin and the whites of the eyes caused by an accumulation of bile pigment (bilirubin) in the blood; can be a symptom of gallstones or liver infection or anemia | Synonyms: jaundice |
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| ictus | (noun) a sudden occurrence (or recurrence) of a disease | Synonyms: raptus, seizure |
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| ignoramus | (noun) an ignorant person | Synonyms: know nothing, uneducated person |
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| ileus | (noun) blockage of the intestine (especially the ileum) that prevents the contents of the intestine from passing to the lower bowel | Synonyms: intestinal obstruction |
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| impetus | (noun) the act of applying force suddenly | Synonyms: impulse, impulsion |
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| (noun) a force that moves something along | Synonyms: drift, impulsion |
| incubus | (noun) a male demon believed to lie on sleeping persons and to have sexual intercourse with sleeping women | - |
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| (noun) someone who depresses or worries others | - |
| (noun) a situation resembling a terrifying dream | Synonyms: nightmare |
| incus | (noun) a small bone in the middle ear between the malleus and the stapes | Synonyms: anvil |
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| introitus | (noun) entrance or opening to a hollow organ or tube (especially the vaginal opening) | - |
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| iridoncus | (noun) swelling of the iris of the eye | - |
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| isthmus | (noun) a cord-like tissue connecting two larger parts of an anatomical structure | Synonyms: band |
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| (noun) a relatively narrow strip of land (with water on both sides) connecting two larger land areas | - |
| keratoconus | (noun) abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia | - |
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| keratonosus | (noun) any disease of the cornea | - |
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| kernicterus | (noun) an abnormal accumulation of bile pigment in the brain and other nerve tissue; causes yellow staining and tissue damage | - |
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| kurus | (noun) 100 kurus equal 1 lira in Turkey | Synonyms: piaster, piastre |
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| lactobacillus | (noun) a Gram-positive rod-shaped bacterium that produces lactic acid (especially in milk) | - |
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| larcenous | (noun) having a disposition to steal | Synonyms: thievishness |
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| laryngismus | (noun) laryngeal spasm caused by the sudden contraction of laryngeal muscles | - |
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| lemniscus | (noun) a bundle of sensory nerve fibers going to the thalamus | Synonyms: fillet |
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| leptocephalus | (noun) slender transparent larva of eels and certain fishes | - |
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| limbus | (noun) a border or edge of any of various body parts distinguished by color or structure | - |
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| litmus | (noun) a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator | Synonyms: litmus test |
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| loculus | (noun) a small cavity or space within an organ or in a plant or animal | Synonyms: locule |
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| locus | (noun) the set of all points or lines that satisfy or are determined by specific conditions | - |
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| (noun) the scene of any event or action (especially the place of a meeting) | Synonyms: locale, venue |
| (noun) the specific site of a particular gene on its chromosome | - |
| lotus | (noun) white Egyptian lotus: water lily of Egypt to southeastern Africa; held sacred by the Egyptians | Synonyms: Egyptian water lily, Nymphaea lotus, white lily, white lotus |
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| (noun) native to eastern Asia; widely cultivated for its large pink or white flowers | Synonyms: Indian lotus, Nelumbo nucifera, sacred lotus |
| lumbus | (noun) either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds | Synonyms: loin |
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| lupus | (noun) any of several forms of ulcerative skin disease | - |
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| lyssavirus | (noun) a neurotropic non-arbovirus of the family Rhabdoviridae that causes rabies | - |
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| macrotus | (noun) large-eared greyish bat of southern California and northwestern Mexico | Synonyms: Macrotus californicus |
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| magus | (noun) a magician or sorcerer of ancient times | - |
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| (noun) a member of the Zoroastrian priesthood of the ancient Persians | - |
| malleus | (noun) the ossicle attached to the eardrum | Synonyms: hammer |
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| mandamus | (noun) an extraordinary writ commanding an official to perform a ministerial act that the law recognizes as an absolute duty and not a matter for the official's discretion; used only when all other judicial remedies fail | Synonyms: writ of mandamus |
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| manus | (noun) the (prehensile) extremity of the superior limb | Synonyms: hand, mitt, paw |
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| marasmus | (noun) extreme malnutrition and emaciation (especially in children); can result from inadequate intake of food or from malabsorption or metabolic disorders | - |
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| meatus | (noun) a natural body passageway | - |
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| megalosaurus | (noun) gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe | Synonyms: megalosaur |
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| melilotus | (noun) erect annual or biennial plant grown extensively especially for hay and soil improvement | Synonyms: melilot, sweet clover |
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| meniscus | (noun) (physics) the curved upper surface of a nonturbulent liquid in a vertical tube | - |
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| (noun) (optics) a lens that is concave on one side and convex on the other | - |
| (noun) (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint | Synonyms: semilunar cartilage |
| mesohippus | (noun) North American three-toed Oligocene animal; probably not directly ancestral to modern horses | - |
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| metacarpus | (noun) the part of the hand between the carpus and phalanges | - |
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| metatarsus | (noun) the skeleton of the human foot between the toes and the tarsus; the corresponding part of the foot in birds or of the hind foot in quadrupeds | - |
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| microcephalus | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephaly, nanocephaly |
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| microphallus | (noun) an abnormally small penis | Synonyms: micropenis |
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| minibus | (noun) a light bus (4 to 10 passengers) | - |
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| minimus | (noun) the fifth digit; the little finger or little toe | - |
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| minus | (noun) an arithmetic operation in which the difference between two numbers is calculated | Synonyms: subtraction |
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| missus | (noun) informal term of address for someone's wife | Synonyms: missis |
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| modiolus | (noun) the central conical bony pillar of the cochlea | - |
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| modulus | (noun) (physics) a coefficient that expresses how much of a specified property is possessed by a specified substance | - |
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| (noun) the absolute value of a complex number | - |
| (noun) an integer that can be divided without remainder into the difference between two other integers | - |
| motorbus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorcoach, omnibus, passenger vehicle |
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| mucus | (noun) protective secretion of the mucous membranes; in the gut it lubricates the passage of food and protects the epithelial cells; in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium | Synonyms: mucous secretion |
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| mumpsimus | (noun) a traditional notion that is obstinately held although it is unreasonable | - |
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| musculus | (noun) one of the contractile organs of the body | Synonyms: muscle |
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| myoclonus | (noun) a clonic spasm of a muscle or muscle group | - |
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| myxovirus | (noun) any of a group of RNA viruses including those that cause influenza and mumps | - |
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| nanus | (noun) a person who is markedly small | Synonyms: dwarf, midget |
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| narcissus | (noun) bulbous plant having erect linear leaves and showy yellow or white flowers either solitary or in clusters | - |
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| nautilus | (noun) cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions | Synonyms: chambered nautilus, pearly nautilus |
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| (noun) cephalopod mollusk of warm seas whose females have delicate papery spiral shells | Synonyms: Argonaut, Argonauta argo, paper nautilus |
| (noun) a submarine that is propelled by nuclear power | Synonyms: nuclear-powered submarine, nuclear submarine |
| negus | (noun) wine and hot water with sugar and lemon juice and nutmeg | - |
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| nervus | (noun) any bundle of nerve fibers running to various organs and tissues of the body | Synonyms: nerve |
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| nevus | (noun) a blemish on the skin that is formed before birth | Synonyms: birthmark |
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| nexus | (noun) a connected series or group | - |
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| (noun) the means of connection between things linked in series | Synonyms: link |
| nidus | (noun) a nest in which spiders or insects deposit their eggs | - |
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| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, focus |
| nimbus | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, aureole, gloriole, glory, halo |
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| (noun) a dark grey cloud bearing rain | Synonyms: nimbus cloud, rain cloud |
| nisus | (noun) an effortful attempt to attain a goal | Synonyms: pains, strain, striving |
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| nous | (noun) that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason | Synonyms: brain, head, mind, psyche |
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| (noun) common sense | - |
| nucellus | (noun) central part of a plant ovule; contains the embryo sac | - |
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| nucleolus | (noun) a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis | Synonyms: nucleole |
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| nucleus | (noun) a part of the cell containing DNA and RNA and responsible for growth and reproduction | Synonyms: cell nucleus, karyon |
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| (noun) any histologically identifiable mass of neural cell bodies in the brain or spinal cord | - |
| (noun) the central structure of the lens that is surrounded by the cortex | Synonyms: lens nucleus |
| (noun) a small group of indispensable persons or things | Synonyms: core, core group |
| (noun) the positively charged dense center of an atom | - |
| (noun) (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail | - |
| nystagmus | (noun) involuntary movements of the eyeballs; its presence or absence is used to diagnose a variety of neurological and visual disorders | - |
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| obolus | (noun) a Greek unit of weight equal to one tenth of a gram | - |
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| ocellus | (noun) an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color | Synonyms: eyespot |
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| (noun) an eye having a single lens | Synonyms: simple eye, stemma |
| octopus | (noun) bottom-living cephalopod having a soft oval body with eight long tentacles | Synonyms: devilfish |
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| (noun) tentacles of octopus prepared as food | - |
| oculus | (noun) the organ of sight | Synonyms: eye, optic |
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| oesophagus | (noun) the passage between the pharynx and the stomach | Synonyms: esophagus, gorge, gullet |
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| oestrus | (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | Synonyms: estrus, heat, rut |
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| omnibus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, passenger vehicle |
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| (noun) an anthology of articles on a related subject or an anthology of the works of a single author | - |
| omphalus | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalos, umbilicus |
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| onus | (noun) an onerous or difficult concern | Synonyms: burden, encumbrance, incumbrance, load |
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| opus | (noun) a musical work that has been created | Synonyms: composition, musical composition, piece, piece of music |
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| orthomyxovirus | (noun) a group of viruses including those causing influenza | - |
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| ostiarius | (noun) the lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic Church | Synonyms: doorkeeper, ostiary |
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| overplus | (noun) extreme excess | Synonyms: embarrassment, plethora, superfluity |
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| pachycephalosaurus | (noun) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found | Synonyms: pachycephalosaur |
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| pandanus | (noun) any of various Old World tropical palmlike trees having huge prop roots and edible conelike fruits and leaves like pineapple leaves | Synonyms: screw pine |
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| (noun) fiber from leaves of the pandanus tree; used for woven articles (such as mats) | - |
| papovavirus | (noun) any of a group of animal viruses associated with or causing papillomas or polyomas | - |
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| pappus | (noun) calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions | - |
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| papyrus | (noun) a document written on papyrus | - |
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| (noun) tall sedge of the Nile valley yielding fiber that served many purposes in historic times | Synonyms: Cyperus papyrus, Egyptian paper reed, Egyptian paper rush, paper plant, paper rush |
| (noun) paper made from the papyrus plant by cutting it in strips and pressing it flat; used by ancient Egyptians and Greeks and Romans | - |
| paramyxovirus | (noun) a group of viruses including those causing mumps and measles | - |
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| parvovirus | (noun) any of a group of viruses containing DNA in an icosahedral protein shell and causing disease in dogs and cattle; not known to be associated with any human disease | Synonyms: parvo |
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| pectus | (noun) the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates | Synonyms: chest, thorax |
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| pemphigus | (noun) a skin disease characterized by large thin-walled blisters (bullae) arising from normal skin or mucous membrane | - |
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| peplus | (noun) a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist | Synonyms: peplos, peplum |
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| peripatus | (noun) any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms | Synonyms: onychophoran, velvet worm |
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| peroneus | (noun) muscle of the lower leg that is involved in moving the foot | - |
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| phaius | (noun) an orchid of the genus Phaius having large plicate leaves and racemes of showy flowers | - |
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| phallus | (noun) the male sex organ | Synonyms: member, penis |
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| philadelphus | (noun) any of various chiefly deciduous ornamental shrubs of the genus Philadelphus having white sweet-scented flowers, single or in clusters; widely grown in temperate regions | - |
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| phlebotomus | (noun) a mild viral disease transmitted by the bite of the sand fly Phlebotomus papatasii | Synonyms: pappataci fever, sandfly fever |
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| phosphorus | (noun) a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms | Synonyms: atomic number 15, P |
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