| monohybrid | (noun) a hybrid produced by crossing parents that are homozygous except for a single gene locus that has two alleles (as in Mendel's experiments with garden peas) | - |
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| monosaccharide | (noun) a sugar (like sucrose or fructose) that does not hydrolyse to give other sugars; the simplest group of carbohydrates | Synonyms: monosaccharose, simple sugar |
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| mucopolysaccharide | (noun) complex polysaccharides containing an amino group; occur chiefly as components of connective tissue | - |
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| mucopolysaccharidosis | (noun) any of a group of genetic disorders involving a defect in the metabolism of mucopolysaccharides resulting in greater than normal levels of mucopolysaccharides in tissues | - |
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| myxosporidian | (noun) mostly parasitic in fishes and including various serious pathogens | - |
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| nightrider | (noun) member of a secret mounted band in United States South after the American Civil War; committed acts of intimidation and revenge | Synonyms: night rider |
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| nitride | (noun) a compound containing nitrogen and a more electropositive element (such as phosphorus or a metal) | - |
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| oligosaccharide | (noun) any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis | - |
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| osmiridium | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: iridosmine |
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| outrider | (noun) an escort who rides ahead (as a member of the vanguard) | - |
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| override | (noun) the act of nullifying; making null and void; counteracting or overriding the effect or force of something | Synonyms: nullification |
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| (noun) a manually operated device to correct the operation of an automatic device | - |
| oviraptorid | (noun) advanced carnivorous theropods, characterized by their toothless, parrot-like beaks and, in several cases, elaborate crests | - |
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| partridge | (noun) small Old World gallinaceous game birds | - |
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| (noun) a popular North American game bird; named for its call | Synonyms: bobwhite, bobwhite quail |
| (noun) valued as a game bird in eastern United States and Canada | Synonyms: Bonasa umbellus, ruffed grouse |
| (noun) heavy-bodied small-winged South American game bird resembling a gallinaceous bird but related to the ratite birds | Synonyms: tinamou |
| (noun) flesh of either quail or grouse | - |
| partridgeberry | (noun) creeping woody plant of eastern North America with shiny evergreen leaves and scarlet berries | Synonyms: boxberry, Mitchella repens, twinberry |
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| pepperidge | (noun) columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall | Synonyms: black gum, Nyssa sylvatica, sour gum |
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| perchloride | (noun) a chloride containing an unusually high proportion of chlorine | - |
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| peridinian | (noun) flagellate with a thick test composed of plates | - |
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| peridium | (noun) outer layer of the spore-bearing organ in many fungi | - |
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| peridot | (noun) a pale green variety of chrysolite; used as a gemstone | - |
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| peridotite | (noun) a dark coarse-grained igneous rock consisting principally of olivine | - |
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| phenazopyridine | (noun) analgesic (trade name Pyridium) used to treat urinary tract infections | Synonyms: Pyridium |
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| pierid | (noun) any of numerous pale-colored butterflies having three pairs of well-developed legs | Synonyms: pierid butterfly |
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| polysaccharide | (noun) any of a class of carbohydrates whose molecules contain chains of monosaccharide molecules | Synonyms: polyose |
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| porridge | (noun) soft food made by boiling oatmeal or other meal or legumes in water or milk until thick | - |
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| pride | (noun) unreasonable and inordinate self-esteem (personified as one of the deadly sins) | Synonyms: superbia |
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| (noun) the trait of being spurred on by a dislike of falling below your standards | - |
| (noun) a feeling of self-respect and personal worth | Synonyms: pridefulness |
| (noun) satisfaction with your (or another's) achievements | - |
| (noun) a group of lions | - |
| pridefulness | (noun) a feeling of self-respect and personal worth | Synonyms: pride |
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| pteridologist | (noun) an expert in the study of ferns | - |
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| pteridology | (noun) the branch of botany that studies ferns | - |
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| pteridophyte | (noun) plants having vascular tissue and reproducing by spores | Synonyms: nonflowering plant |
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| pteridosperm | (noun) an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae) | Synonyms: seed fern |
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| putridity | (noun) the state of being putrid | - |
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| putridness | (noun) in a state of progressive putrefaction | Synonyms: corruption, putrescence, rottenness |
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| pyridine | (noun) a toxic colorless flammable liquid organic base with a disagreeable odor; usually derived from coal | - |
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| pyridoxal | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: adermin, pyridoxamine, pyridoxine, vitamin B6 |
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| pyridoxamine | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: adermin, pyridoxal, pyridoxine, vitamin B6 |
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| pyridoxine | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: adermin, pyridoxal, pyridoxamine, vitamin B6 |
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| rhinosporidiosis | (noun) fungal infection of the nose; often acquired while swimming | - |
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| riddance | (noun) the act of forcing out someone or something | Synonyms: ejection, exclusion, expulsion |
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| (noun) the act of removing or getting rid of something | Synonyms: elimination |
| riddle | (noun) a coarse sieve (as for gravel) | - |
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| (noun) a difficult problem | Synonyms: brain-teaser, conundrum, enigma |
| ride | (noun) a journey in a vehicle (usually an automobile) | Synonyms: drive |
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| (noun) a mechanical device that you ride for amusement or excitement | - |
| rider | (noun) a clause that is appended to a legislative bill | - |
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| (noun) a traveler who actively rides an animal (as a horse or camel) | - |
| (noun) a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it | Synonyms: passenger |
| (noun) a traveler who actively rides a vehicle (as a bicycle or motorcycle) | - |
| ridge | (noun) a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters | Synonyms: ridgepole, rooftree |
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| (noun) any long raised border or margin of a bone or tooth or membrane | - |
| (noun) a long narrow natural elevation or striation | - |
| (noun) a long narrow range of hills | Synonyms: ridgeline |
| (noun) a long narrow natural elevation on the floor of the ocean | - |
| (noun) any long raised strip | - |
| ridgel | (noun) a colt with undescended testicles | Synonyms: ridgeling, ridgil, ridgling |
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| ridgeline | (noun) a long narrow range of hills | Synonyms: ridge |
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| ridgeling | (noun) a colt with undescended testicles | Synonyms: ridgel, ridgil, ridgling |
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| ridgepole | (noun) a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters | Synonyms: ridge, rooftree |
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| ridgil | (noun) a colt with undescended testicles | Synonyms: ridgel, ridgeling, ridgling |
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| ridgling | (noun) a colt with undescended testicles | Synonyms: ridgel, ridgeling, ridgil |
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| ridicule | (noun) the act of deriding or treating with contempt | Synonyms: derision |
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| (noun) language or behavior intended to mock or humiliate | - |
| ridiculer | (noun) a humorist who uses ridicule and irony and sarcasm | Synonyms: ironist, satirist |
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| ridiculousness | (noun) a message whose content is at variance with reason | Synonyms: absurdity, absurdness |
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| riding | (noun) travel by being carried on horseback | Synonyms: horseback riding |
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| (noun) the sport of sitting on the back of a horse while controlling its movements | Synonyms: equitation, horseback riding |
| ridley | (noun) a marine turtle | - |
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| roridula | (noun) either of 2 species of the genus Roridula; South African viscid perennial low-growing woody shrubs | - |
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| roughrider | (noun) a horseman skilled at breaking wild horses to the saddle | - |
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| saccharide | (noun) an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain | Synonyms: carbohydrate, sugar |
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| sarcosporidian | (noun) parasite of the muscles of vertebrates | Synonyms: sarcocystidean, sarcocystieian |
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| sciarid | (noun) minute blackish gregarious flies destructive to mushrooms and seedlings | Synonyms: fungus gnat, sciara |
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| silurid | (noun) Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin | Synonyms: silurid fish |
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| sparid | (noun) spiny-finned food fishes of warm waters having well-developed teeth | Synonyms: sparid fish |
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| stride | (noun) a step in walking or running | Synonyms: pace, tread |
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| (noun) significant progress (especially in the phrase `make strides') | - |
| (noun) the distance covered by a step | Synonyms: footstep, pace, step |
| stridence | (noun) having the timbre of a loud high-pitched sound | Synonyms: shrillness, stridency |
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| stridency | (noun) having the timbre of a loud high-pitched sound | Synonyms: shrillness, stridence |
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| strider | (noun) a person who walks rapidly with long steps | - |
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| stridor | (noun) a whistling sound when breathing (usually heard on inspiration); indicates obstruction of the trachea or larynx | - |
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| stridulation | (noun) a shrill grating or chirping noise made by some insects by rubbing body parts together | - |
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| sulfapyridine | (noun) sulfa drug derived from pyridine and sulfanilamide | - |
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| surfriding | (noun) the sport of riding a surfboard toward the shore on the crest of a wave | Synonyms: surfboarding, surfing |
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| telluride | (noun) any binary compound of tellurium with other more electropositive elements | - |
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| tetrachloride | (noun) any compound that contains four chlorine atoms per molecule | - |
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| tetrasaccharide | (noun) any of a variety of carbohydrates that yield four monosaccharide molecules on complete hydrolysis | - |
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| theridiid | (noun) spider having a comb-like row of bristles on each hind foot | Synonyms: comb-footed spider |
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| thioridazine | (noun) a tranquilizer (trade name Mellaril) used to treat schizophrenia and other psychotic disorders | Synonyms: Mellaril |
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| torridity | (noun) extreme heat | - |
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| trichloride | (noun) any compound containing three chlorine atoms in each molecule | - |
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| trident | (noun) a spear with three prongs | - |
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| tridymite | (noun) a mineral form of silica | - |
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| triglyceride | (noun) glyceride occurring naturally in animal and vegetable tissues; it consists of three individual fatty acids bound together in a single large molecule; an important energy source forming much of the fat stored by the body | - |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| trisaccharide | (noun) any of a variety of carbohydrates that yield three monosaccharide molecules on complete hydrolysis | - |
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| unabridged | (noun) a dictionary that has not been shortened by the omitting terms or definitions; a comprehensive dictionary | Synonyms: unabridged dictionary |
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| viridity | (noun) green color or pigment; resembling the color of growing grass | Synonyms: green, greenness |
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| weighbridge | (noun) platform scale flush with a roadway for weighing vehicles and cattle etc | - |
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