| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
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| aminopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: amidopyrine |
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| antipyresis | (noun) medication with antipyretics to treat a fever | - |
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| antipyretic | (noun) any medicine that lowers body temperature to prevent or alleviate fever | Synonyms: febrifuge |
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| argyrodite | (noun) a rare steel-grey mineral consisting of silver and germanium and sulfur | - |
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| arsenopyrite | (noun) a silver-white or grey ore of arsenic | Synonyms: mispickel |
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| autogyro | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogiro, gyroplane |
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| butyrin | (noun) any of three glycerides of butyric acid | - |
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| byre | (noun) a barn for cows | Synonyms: cow barn, cowbarn, cowhouse, cowshed |
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| byrnie | (noun) a long (usually sleeveless) tunic of chain mail formerly worn as defensive armor | Synonyms: hauberk |
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| byroad | (noun) a side road little traveled (as in the countryside) | Synonyms: bypath, byway |
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| chalcopyrite | (noun) a yellow copper ore (CuFeS2) made up of copper and iron sulfide | Synonyms: copper pyrites |
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| chlorpyrifos | (noun) a common organophosphate insecticide | - |
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| collyrium | (noun) lotion consisting of a solution used as a cleanser for the eyes | Synonyms: eye-lotion, eyewash |
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| copyreader | (noun) an editor who prepares text for publication | Synonyms: copy editor, text editor |
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| copyright | (noun) a document granting exclusive right to publish and sell literary or musical or artistic work | Synonyms: right of first publication |
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| cyrilla | (noun) shrub or small tree of southeastern United States to West Indies and Brazil; grown for the slender racemes of white flowers and orange and crimson foliage | Synonyms: Cyrilla racemiflora, leatherwood, white titi |
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| deoxyribose | (noun) a sugar that is a constituent of nucleic acids | - |
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| dithyramb | (noun) (ancient Greece) a passionate hymn (usually in honor of Dionysus) | - |
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| (noun) a wildly enthusiastic speech or piece of writing | - |
| empyrean | (noun) the apparent surface of the imaginary sphere on which celestial bodies appear to be projected | Synonyms: celestial sphere, firmament, heavens, sphere, vault of heaven, welkin |
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| eyra | (noun) long-bodied long-tailed tropical American wildcat | Synonyms: Felis yagouaroundi, jaguarondi, jaguarundi, jaguarundi cat |
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| eyrie | (noun) any habitation at a high altitude | Synonyms: aerie, aery, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, aery, eyry |
| eyrir | (noun) 100 aurar equal 1 krona in Iceland | - |
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| eyry | (noun) any habitation at a high altitude | Synonyms: aerie, aery, eyrie |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, aery, eyrie |
| gyration | (noun) the act of rotating in a circle or spiral | Synonyms: whirling |
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| (noun) a single complete turn (axial or orbital) | Synonyms: revolution, rotation |
| gyre | (noun) a round shape formed by a series of concentric circles (as formed by leaves or flower petals) | Synonyms: coil, curl, curlicue, ringlet, roll, scroll, whorl |
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| gyrfalcon | (noun) large and rare Arctic falcon having white and dark color phases | Synonyms: Falco rusticolus, gerfalcon |
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| gyro | (noun) rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction | Synonyms: gyroscope |
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| (noun) a Greek sandwich: sliced roast lamb with onion and tomato stuffed into pita bread | - |
| gyrocompass | (noun) a compass that does not depend on magnetism but uses a gyroscope instead | - |
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| gyromitra | (noun) any fungus of the genus Gyromitra | - |
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| gyroplane | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogiro, autogyro |
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| gyroscope | (noun) rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction | Synonyms: gyro |
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| gyrostabiliser | (noun) a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane | Synonyms: gyrostabilizer |
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| gyrostabilizer | (noun) a stabilizer consisting of a heavy gyroscope that spins on a vertical axis; reduces side-to-side rolling of a ship or plane | Synonyms: gyrostabiliser |
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| gyrus | (noun) a convex fold or elevation in the surface of the brain | Synonyms: convolution |
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| hayrack | (noun) a frame attached to a wagon to increase the amount of hay it can carry | Synonyms: hayrig |
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| (noun) a rack that holds hay for feeding livestock | - |
| hayrick | (noun) a stack of hay | Synonyms: haystack, rick |
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| hayrig | (noun) a frame attached to a wagon to increase the amount of hay it can carry | Synonyms: hayrack |
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| hydrargyrum | (noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures | Synonyms: atomic number 80, Hg, mercury, quicksilver |
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| hyperparathyroidism | (noun) excessive secretion of parathyroid hormone resulting in abnormally high levels of calcium in the blood; can affect many systems of the body (especially causing bone resorption and osteoporosis) | - |
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| hyperpyrexia | (noun) extremely high fever (especially in children) | - |
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| hyperthyroidism | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: thyrotoxicosis |
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| hypoparathyroidism | (noun) inadequate secretion of parathyroid hormone resulting in abnormally low levels of calcium in the blood | - |
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| hypothyroidism | (noun) an underactive thyroid gland; a glandular disorder resulting from insufficient production of thyroid hormones | - |
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| hyrax | (noun) any of several small ungulate mammals of Africa and Asia with rodent-like incisors and feet with hooflike toes | Synonyms: coney, cony, das, dassie |
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| iodothyronine | (noun) thyronine with iodine added | - |
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| iodotyrosine | (noun) tyrosine with iodine added | - |
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| jellyroll | (noun) thin sheet of sponge cake spread with jelly and then rolled up to make a cylindrical cake | Synonyms: Swiss roll |
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| joyride | (noun) a ride in a car taken solely for pleasure | - |
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| labyrinth | (noun) complex system of paths or tunnels in which it is easy to get lost | Synonyms: maze |
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| (noun) a complex system of interconnecting cavities; concerned with hearing and equilibrium | Synonyms: inner ear, internal ear |
| labyrinthitis | (noun) inflammation of the inner ear; can cause vertigo and vomiting | Synonyms: otitis interna |
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| labyrinthodont | (noun) an amphibian of the superorder Labyrinthodontia | - |
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| liothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: T, triiodothyronine |
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| lyre | (noun) a harp used by ancient Greeks for accompaniment | - |
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| lyrebird | (noun) Australian bird that resembles a pheasant; the courting male displays long tail feathers in a lyre shape | - |
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| lyreflower | (noun) garden plant having deep-pink drooping heart-shaped flowers | Synonyms: bleeding heart, Dicentra spectabilis, lyre-flower |
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| lyric | (noun) a short poem of songlike quality | Synonyms: lyric poem |
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| (noun) the text of a popular song or musical-comedy number | Synonyms: language, words |
| lyricality | (noun) the property of being suitable for singing | Synonyms: lyricism, songfulness |
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| lyricism | (noun) the property of being suitable for singing | Synonyms: lyricality, songfulness |
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| (noun) unrestrained and exaggerated enthusiasm | - |
| lyricist | (noun) a person who writes the words for songs | Synonyms: lyrist |
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| lyrist | (noun) a person who writes the words for songs | Synonyms: lyricist |
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| martyr | (noun) one who suffers for the sake of principle | Synonyms: sufferer |
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| (noun) one who voluntarily suffers death as the penalty for refusing to renounce their religion | - |
| martyrdom | (noun) death that is imposed because of the person's adherence of a religious faith or cause | - |
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| (noun) any experience that causes intense suffering | Synonyms: calvary |
| mesophyron | (noun) a smooth prominence of the frontal bone between and above the eyebrows; the most forward projecting point of the forehead in the midline at the level of the supraorbital ridges | Synonyms: glabella |
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| methapyrilene | (noun) antihistamine used to treat allergic responses (as rhinitis or dermatitis or pruritus) | - |
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| myriad | (noun) the cardinal number that is the product of ten and one thousand | Synonyms: 10000, ten thousand |
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| (noun) a large indefinite number | - |
| myriagram | (noun) one ten thousandth of a centner | Synonyms: myg |
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| myriameter | (noun) a metric unit of length equal to 10,000 meters | Synonyms: mym, myriametre |
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| myriametre | (noun) a metric unit of length equal to 10,000 meters | Synonyms: mym, myriameter |
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| myriapod | (noun) general term for any terrestrial arthropod having an elongated body composed of many similar segments: e.g. centipedes and millipedes | - |
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| myringa | (noun) the membrane in the ear that vibrates to sound | Synonyms: eardrum, tympanic membrane, tympanum |
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| myringectomy | (noun) surgical removal of the eardrum | - |
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| myringoplasty | (noun) surgical repair of a perforated eardrum with a tissue graft | - |
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| myringotomy | (noun) surgical incision into the eardrum (to relieve pressure or release pus from the middle ear) | - |
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| myrmecophile | (noun) an organism such as an insect that habitually shares the nest of a species of ant | - |
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| myrmecophyte | (noun) plant that affords shelter or food to ants that live in symbiotic relations with it | - |
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| myrmidon | (noun) a follower who carries out orders without question | - |
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| myrobalan | (noun) small Asiatic tree bearing edible red or yellow fruit | Synonyms: cherry plum, myrobalan plum, Prunus cerasifera |
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| myrrh | (noun) aromatic resin that is burned as incense and used in perfume | Synonyms: gum myrrh, sweet cicely |
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| myrtle | (noun) any evergreen shrub or tree of the genus Myrtus | - |
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| (noun) widely cultivated as a groundcover for its dark green shiny leaves and usually blue-violet flowers | Synonyms: Vinca minor |
| palmyra | (noun) tall fan palm of Africa and India and Malaysia yielding a hard wood and sweet sap that is a source of palm wine and sugar; leaves used for thatching and weaving | Synonyms: Borassus flabellifer, longar palm, lontar, palmyra palm, toddy palm, wine palm |
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| panegyric | (noun) a formal expression of praise | Synonyms: encomium, eulogy, paean, pean |
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| panegyrist | (noun) an orator who delivers eulogies or panegyrics | Synonyms: eulogist |
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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 | - |
| parathyroid | (noun) any one of four endocrine glands situated above or within the thyroid gland | Synonyms: parathyroid gland |
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| payroll | (noun) the department that determines the amounts of wage or salary due to each employee | Synonyms: payroll department |
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| (noun) a list of employees and their salaries | Synonyms: paysheet |
| (noun) the total amount of money paid in wages | Synonyms: paysheet |
| pennyroyal | (noun) Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil | Synonyms: Mentha pulegium |
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| (noun) erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine | Synonyms: American pennyroyal, Hedeoma pulegioides |
| phenazopyridine | (noun) analgesic (trade name Pyridium) used to treat urinary tract infections | Synonyms: Pyridium |
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| pityriasis | (noun) any of several skin disorders characterized by shedding dry flakes of skin | - |
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| platyrrhine | (noun) hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails | Synonyms: New World monkey, platyrrhinian |
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| platyrrhinian | (noun) hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails | Synonyms: New World monkey, platyrrhine |
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| playroom | (noun) a recreation room for noisy activities (parties or children's play etc) | Synonyms: game room, rumpus room |
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| polystyrene | (noun) a polymer of styrene; a rigid transparent thermoplastic | - |
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| porphyria | (noun) a genetic abnormality of metabolism causing abdominal pains and mental confusion | - |
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| porphyrin | (noun) any of various pigments distributed widely in living tissues | - |
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| porphyry | (noun) any igneous rock with crystals embedded in a finer groundmass of minerals | Synonyms: porphyritic rock |
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| puttyroot | (noun) North American orchid bearing a single leaf and yellowish-brown flowers | Synonyms: adam-and-eve, Aplectrum hyemale |
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| pyracanth | (noun) any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries | Synonyms: fire thorn, firethorn, Pyracantha |
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| pyralid | (noun) usually tropical slender-bodied long-legged moth whose larvae are crop pests | Synonyms: pyralid moth |
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| pyramid | (noun) (stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases | - |
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| (noun) a polyhedron having a polygonal base and triangular sides with a common vertex | - |