| horsehead | (noun) any of several silvery marine fishes with very flat bodies | Synonyms: Atlantic moonfish, dollarfish, horse-head, horsefish, moonfish, Selene setapinnis |
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| horsehide | (noun) leather from the hide of a horse | - |
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| horselaugh | (noun) a loud laugh that sounds like a horse neighing | Synonyms: ha-ha, haw-haw, hee-haw |
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| horseleech | (noun) any of several large freshwater leeches | - |
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| horseman | (noun) a person who breeds and cares for horses | Synonyms: horse fancier |
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| (noun) a man skilled in equitation | - |
| horsemanship | (noun) skill in handling and riding horses | - |
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| horsemeat | (noun) the flesh of horses as food | Synonyms: horseflesh |
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| horsemint | (noun) a coarse Old World wild water mint having long leaves and spikelike clusters of flowers; naturalized in the eastern United States | Synonyms: Mentha longifolia |
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| (noun) tall erect perennial or annual having lanceolate leaves and heads of purple-spotted creamy flowers; many subspecies grown from eastern to southwestern United States and in Mexico | Synonyms: Monarda punctata |
| (noun) an annual horsemint of central and western United States and northern Mexico | Synonyms: lemon mint, Monarda citriodora |
| horseplay | (noun) rowdy or boisterous play | - |
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| horsepond | (noun) a pond for watering horses | - |
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| horsepower | (noun) a unit of power equal to 746 watts | Synonyms: H.P., HP |
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| horseradish | (noun) grated horseradish root | - |
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| (noun) coarse Eurasian plant cultivated for its thick white pungent root | Synonyms: Armoracia rusticana, horse radish, red cole |
| (noun) the root of the horseradish plant; it is grated or ground and used for seasoning | Synonyms: horseradish root |
| horseshit | (noun) Obscene word for unacceptable behavior | Synonyms: bull, bullshit, crap, dogshit, Irish bull, shit |
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| horseshoe | (noun) U-shaped plate nailed to underside of horse's hoof | Synonyms: shoe |
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| (noun) game equipment consisting of an open ring of iron used in playing horseshoes | - |
| (verb) equip (a horse) with a horseshoe or horseshoes | - |
| horseshoer | (noun) a person who shoes horses | Synonyms: farrier |
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| horseshoes | (noun) a game in which iron rings (or open iron rings) are thrown at a stake in the ground in the hope of encircling it | Synonyms: quoits |
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| horseshow | (noun) a competitive exhibition of horses | - |
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| horsetail | (noun) perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in Northern Hemisphere; some in Africa and South America | - |
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| horseweed | (noun) common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron | Synonyms: Canadian fleabane, Conyza canadensis, Erigeron canadensis, fleabane |
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| (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, richweed, stone-root, stone root, stoneroot |
| horsewhip | (noun) a whip for controlling horses | - |
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| (verb) whip with a whip intended for horses | - |
| horsewhipping | (noun) the act of whipping with a horsewhip | - |
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| horsewoman | (noun) a woman horseman | - |
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| horst | (noun) a ridge of the earth's crust that has been forced upward between two faults and so is higher than the surrounding land | - |
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| hortative | (adjective) giving strong encouragement | Synonyms: exhortative, exhortatory, hortatory |
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| hortatory | (adjective) giving strong encouragement | Synonyms: exhortative, exhortatory, hortative |
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| hortensia | (noun) deciduous shrub bearing roundheaded flower clusters opening green and aging to pink or blue | Synonyms: Hydrangea macrophylla hortensis |
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| (noun) very tall branching herb with showy much-doubled yellow flower heads | Synonyms: double gold, golden glow, Rudbeckia laciniata hortensia |
| horticultural | (adjective) of or relating to the cultivation of plants | - |
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| horticulturally | (adverb) by means of horticulture | - |
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| horticulture | (noun) the cultivation of plants | Synonyms: gardening |
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| horticulturist | (noun) an expert in the science of cultivating plants (fruit or flowers or vegetables or ornamental plants) | Synonyms: plantsman |
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| hydrothorax | (noun) accumulation of fluid in the pleural cavity (the space between the lungs and the walls of the chest) often resulting from disease of the heart or kidneys | - |
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| ichor | (noun) a fluid product of inflammation | Synonyms: festering, purulence, pus, sanies, suppuration |
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| (noun) (Greek mythology) the rarified fluid said to flow in the veins of the Gods | - |
| ichorous | (adjective) of or resembling or characterized by ichor or sanies | Synonyms: sanious |
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| immunoelectrophoresis | (noun) electrophoresis to separate antigens and antibodies | - |
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| inshore | (adjective) (of winds) coming from the sea toward the land | Synonyms: onshore, shoreward |
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| (adjective) close to a shore | - |
| (adverb) toward the shore | - |
| ionophoresis | (noun) the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode | Synonyms: cataphoresis, dielectrolysis, electrophoresis |
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| iontophoresis | (noun) therapy that uses a local electric current to introduce the ions of a medicine into the tissues | Synonyms: electromotive drug administration, EMDA, ionic medication, iontotherapy |
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| kinetochore | (noun) a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape | Synonyms: centromere |
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| krummhorn | (noun) a Renaissance woodwind with a double reed and a curving tube (crooked horn) | Synonyms: cromorne, crumhorn |
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| lakeshore | (noun) the shore of a lake | Synonyms: lakeside |
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| leghorn | (noun) a stiff hat made of straw with a flat crown | Synonyms: boater, Panama, Panama hat, sailor, skimmer, straw hat |
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| longhorn | (noun) long-horned beef cattle formerly common in southwestern United States | Synonyms: Texas longhorn |
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| longshoreman | (noun) a laborer who loads and unloads vessels in a port | Synonyms: dock-walloper, dock worker, docker, dockhand, dockworker, loader, lumper, stevedore |
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| mantichora | (noun) a mythical monster having the head of man (with horns) and the body of a lion and the tail of a scorpion | Synonyms: manticora, manticore, mantiger |
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| markhor | (noun) large Himalayan goat with large spiraled horns | Synonyms: Capra falconeri, markhoor |
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| mastigophoran | (noun) a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals | Synonyms: flagellate, flagellate protozoan, flagellated protozoan, mastigophore |
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| mastigophore | (noun) a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals | Synonyms: flagellate, flagellate protozoan, flagellated protozoan, mastigophoran |
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| metaphor | (noun) a figure of speech in which an expression is used to refer to something that it does not literally denote in order to suggest a similarity | - |
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| metaphoric | (adjective) expressing one thing in terms normally denoting another | Synonyms: metaphorical |
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| metaphorical | (adjective) expressing one thing in terms normally denoting another | Synonyms: metaphoric |
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| metaphorically | (adverb) in a metaphorical manner | - |
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| neurohormone | (noun) a hormone that is released by nerve impulses (e.g., norepinephrine or vasopressin) | - |
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| notochord | (noun) a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates | - |
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| offshore | (adjective) (of winds) coming from the land | Synonyms: seaward |
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| (adjective) at some distance from the shore | - |
| (adverb) away from shore; away from land | - |
| onshore | (adjective) (of winds) coming from the sea toward the land | Synonyms: inshore, shoreward |
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| (adjective) on the edge of the land | - |
| (adverb) on or toward the land | - |
| onychophoran | (noun) any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms | Synonyms: peripatus, velvet worm |
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| oophorectomy | (noun) surgical removal of one or both ovaries | Synonyms: ovariectomy |
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| oophoritis | (noun) inflammation of one or both ovaries | - |
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| oophorosalpingectomy | (noun) surgical removal of one or both ovaries and the corresponding Fallopian tubes | - |
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| opisthorchiasis | (noun) infestation with flukes obtained from eating raw fish; common in eastern Asia | - |
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| orthochorea | (noun) a form of chorea in which spasms occur mainly when the patient is erect | - |
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| packhorse | (noun) a workhorse used as a pack animal | - |
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| parathormone | (noun) hormone synthesized and released into the blood stream by the parathyroid glands; regulates phosphorus and calcium in the body and functions in neuromuscular excitation and blood clotting | Synonyms: parathyroid hormone |
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| phoenicophorium | (noun) latanier palm | Synonyms: genus Phoenicophorium |
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| phoronid | (noun) hermaphrodite wormlike animal living in mud of the sea bottom | - |
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| phosphor | (noun) a synthetic substance that is fluorescent or phosphorescent; used to coat the screens of cathode ray tubes | - |
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| phosphoresce | (verb) to exhibit phosphorescence | - |
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| phosphorescence | (noun) a fluorescence that persists after the bombarding radiation has ceased | - |
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| phosphorescent | (adjective) emitting light without appreciable heat as by slow oxidation of phosphorous | - |
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| phosphoric | (adjective) containing or characteristic of phosphorus | Synonyms: phosphorous |
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| phosphorous | (adjective) containing or characteristic of phosphorus | Synonyms: phosphoric |
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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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| phytohormone | (noun) (botany) a plant product that acts like a hormone | Synonyms: growth regulator, plant hormone |
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| plethora | (noun) extreme excess | Synonyms: embarrassment, overplus, superfluity |
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| plethoric | (adjective) excessively abundant | Synonyms: overabundant, rife |
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| pneumatophore | (noun) an air-filled root (submerged or exposed) that can function as a respiratory organ of a marsh or swamp plant | - |
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| pneumothorax | (noun) abnormal presence of air in the pleural cavity resulting in the collapse of the lung; may be spontaneous (due to injury to the chest) or induced (as a treatment for tuberculosis) | - |
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| pogonophoran | (noun) slender animal with tentacles and a tubelike outer covering; lives on the deep ocean bottom | Synonyms: beard worm |
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| polyplacophore | (noun) primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates | Synonyms: chiton, coat-of-mail shell, sea cradle |
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| pronghorn | (noun) fleet antelope-like ruminant of western North American plains with small branched horns | Synonyms: American antelope, Antilocapra americana, prongbuck, pronghorn antelope |
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| prothorax | (noun) the anterior part of an insect's thorax; bears the first pair of legs | - |
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| racehorse | (noun) a horse bred for racing | Synonyms: bangtail, race horse |
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| radiothorium | (noun) radioactive isotope of thorium with mass number 228 | Synonyms: thorium-228 |
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| redhorse | (noun) North American sucker with reddish fins | Synonyms: redhorse sucker |
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| sawhorse | (noun) a framework for holding wood that is being sawed | Synonyms: buck, horse, sawbuck |
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| saxhorn | (noun) any of a family of brass wind instruments that resemble a bugle with valves | - |
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| schorl | (noun) black tourmaline | - |
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| seahorse | (noun) small fish with horse-like heads bent sharply downward and curled tails; swim in upright position | Synonyms: sea horse |
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| (noun) either of two large northern marine mammals having ivory tusks and tough hide over thick blubber | Synonyms: sea horse, walrus |
| seashore | (noun) the shore of a sea or ocean | Synonyms: coast, sea-coast, seacoast |
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| semaphore | (noun) an apparatus for visual signaling with lights or mechanically moving arms | - |
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| (verb) convey by semaphore, of information | - |
| (verb) send signals by or as if by semaphore | - |
| shoehorn | (noun) a device used for easing the foot into a shoe | - |
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| (verb) fit for a specific purpose even when not well suited | - |
| shore | (noun) a beam or timber that is propped against a structure to provide support | Synonyms: shoring |
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| (noun) the land along the edge of a body of water | - |
| (verb) support by placing against something solid or rigid | Synonyms: prop, prop up, shore up |
| (verb) arrive on shore | Synonyms: land, set ashore |
| (verb) serve as a shore to | - |
| shorebird | (noun) any of numerous wading birds that frequent mostly seashores and estuaries | Synonyms: limicoline bird, shore bird |
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| shoreline | (noun) a boundary line between land and water | - |
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| shoreward | (adjective) (of winds) coming from the sea toward the land | Synonyms: inshore, onshore |
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| shoring | (noun) the act of propping up with shores | Synonyms: propping up, shoring up |
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| (noun) a beam or timber that is propped against a structure to provide support | Synonyms: shore |
| shorn | (adjective) having the hair or wool cut or clipped off as if with shears or clippers | Synonyms: sheared |
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| short | (adjective) (of memory) deficient in retentiveness or range | Synonyms: forgetful, unretentive |
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| (adjective) (primarily spatial sense) having little length or lacking in length | - |
| (adjective) primarily temporal sense; indicating or being or seeming to be limited in duration | - |
| (adjective) low in stature; not tall; describing something or someone with a stature less than normal | Synonyms: little |
| (adjective) of speech sounds or syllables of relatively short duration | - |
| (adjective) not holding securities or commodities that one sells in expectation of a fall in prices | - |
| (adjective) tending to crumble or break into flakes due to a large amount of shortening | - |
| (adjective) marked by rude or peremptory shortness | Synonyms: brusk, brusque, curt |
| (adjective) lacking foresight or scope | Synonyms: myopic, shortsighted, unforesightful |
| (adjective) of insufficient quantity to meet a need | Synonyms: inadequate, jejune, poor |
| (adjective) less than the correct or legal or full amount often deliberately so | Synonyms: light, scant |
| (noun) the fielding position of the player on a baseball team who is stationed between second and third base | Synonyms: shortstop |
| (noun) the location on a baseball field where the shortstop is stationed | - |
| (noun) accidental contact between two points in an electric circuit that have a potential difference | Synonyms: short circuit |
| (adverb) in a curt, abrupt and discourteous manner | Synonyms: curtly, shortly |
| (adverb) at a disadvantage | Synonyms: unawares |
| (adverb) so as to interrupt | - |
| (adverb) at some point or distance before a goal is reached | - |
| (adverb) clean across | - |
| (adverb) without possessing something at the time it is contractually sold | - |
| (adverb) quickly and without warning; happening unexpectedly; on impulse; without premeditation | Synonyms: abruptly, all of a sudden, dead, of a sudden, on the spur of the moment, suddenly |
| (verb) create a short circuit in | Synonyms: short-circuit |
| (verb) cheat someone by not returning him enough money | Synonyms: short-change |
| shortage | (noun) the property of being an amount by which something is less than expected or required | Synonyms: deficit, shortfall |
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| (noun) an acute insufficiency | Synonyms: dearth, famine |
| shortbread | (noun) very rich thick butter cookie | Synonyms: shortbread cookie |
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