| ketosteroid | (noun) a steroid containing a ketone group | - |
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| langouste | (noun) large edible marine crustacean having a spiny carapace but lacking the large pincers of true lobsters | Synonyms: crawfish, crayfish, rock lobster, sea crawfish, spiny lobster |
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| (noun) warm-water lobsters without claws; those from Australia and South Africa usually marketed as frozen tails; caught also in Florida and California | Synonyms: crayfish, rock lobster, spiny lobster |
| laryngostenosis | (noun) abnormal narrowing of the larynx | - |
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| leister | (noun) a spear with three or more prongs; used for spearing fish (especially salmon) | - |
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| listener | (noun) someone who listens attentively | Synonyms: attender, auditor, hearer |
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| listenership | (noun) all the listeners collectively of a particular radio programme, station, or broadcaster. | - |
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| listening | (noun) the act of hearing attentively | Synonyms: hearing |
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| lister | (noun) moldboard plow with a double moldboard designed to move dirt to either side of a central furrow | Synonyms: lister plough, lister plow, middle buster, middlebreaker |
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| (noun) assessor who makes out the tax lists | - |
| listeria | (noun) any species of the genus Listeria | - |
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| listeriosis | (noun) an infectious disease of animals and humans (especially newborn or immunosuppressed persons) caused by the bacterium Listeria monocytogenes; in sheep and cattle the infection frequently involves the central nervous system and causes various neurological symptoms | Synonyms: listeria meningitis |
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| lobster | (noun) any of several edible marine crustaceans of the families Homaridae and Nephropsidae and Palinuridae | - |
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| (noun) flesh of a lobster | - |
| lobsterback | (noun) British soldier; so-called because of his red coat (especially during the American Revolution) | Synonyms: redcoat |
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| lobsterman | (noun) a person whose occupation is catching lobsters | - |
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| lockmaster | (noun) a worker in charge of a lock (on a canal) | Synonyms: lockkeeper, lockman |
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| lockstep | (noun) a manner of marching in file in which each person's leg moves with and behind the corresponding leg of the person ahead | - |
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| (noun) a standard procedure that is followed mindlessly | - |
| luster | (noun) a surface coating for ceramics or porcelain | Synonyms: lustre |
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| (noun) a quality that outshines the usual | Synonyms: brilliancy, lustre, splendor, splendour |
| (noun) the visual property of something that shines with reflected light | Synonyms: lustre, sheen, shininess |
| lusterlessness | (noun) the property of having little or no contrast; lacking highlights or gloss | Synonyms: flatness, lustrelessness, mat, matt, matte |
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| lusterware | (noun) pottery with a metallic sheen produced by adding metallic oxides to the glaze | - |
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| maltster | (noun) a maker of malt | Synonyms: maltman |
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| mangosteen | (noun) two- to three-inch tropical fruit with juicy flesh suggestive of both peaches and pineapples | - |
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| (noun) East Indian tree with thick leathery leaves and edible fruit | Synonyms: Garcinia mangostana, mangosteen tree |
| mastectomy | (noun) surgical removal of a breast to remove a malignant tumor | - |
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| master | (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master copy, original |
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| (noun) key that secures entrance everywhere | Synonyms: master key, passe-partout, passkey |
| (noun) an artist of consummate skill | Synonyms: maestro |
| (noun) a combatant who is able to defeat rivals | Synonyms: superior, victor |
| (noun) an authority qualified to teach apprentices | Synonyms: professional |
| (noun) directs the work of others | - |
| (noun) a person who has general authority over others | Synonyms: lord, overlord |
| (noun) someone who holds a master's degree from academic institution | - |
| (noun) presiding officer of a school | Synonyms: headmaster, schoolmaster |
| (noun) an officer who is licensed to command a merchant ship | Synonyms: captain, sea captain, skipper |
| mastering | (noun) the act of making a master recording from which copies can be made | - |
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| (noun) becoming proficient in the use of something; having mastery of | - |
| mastermind | (noun) someone who creates new things | Synonyms: conceiver, originator |
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| (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, brainiac, Einstein, genius |
| masterpiece | (noun) an outstanding achievement | - |
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| (noun) the most outstanding work of a creative artist or craftsman | Synonyms: chef-d'oeuvre |
| mastership | (noun) the position of master | - |
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| (noun) the skill of a master | - |
| masterstroke | (noun) an achievement demonstrating great skill or mastery | - |
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| masterwort | (noun) any plant of the genus Astrantia | Synonyms: astrantia |
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| mastery | (noun) the act of mastering or subordinating someone | Synonyms: subordination |
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| (noun) great skillfulness and knowledge of some subject or activity | Synonyms: command, control |
| (noun) power to dominate or defeat | Synonyms: domination, supremacy |
| medroxyprogesterone | (noun) a progestin compound (trade name Provera) used to treat menstrual disorders | Synonyms: Provera |
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| meristem | (noun) undifferentiated tissue from which new cells are formed, as at the tip of a stem or root | - |
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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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| minister | (noun) the job of a head of a government department | - |
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| (noun) a person authorized to conduct religious worship | Synonyms: curate, minister of religion, parson, pastor, rector |
| (noun) a diplomat representing one government to another; ranks below ambassador | Synonyms: diplomatic minister |
| (noun) a person appointed to a high office in the government | Synonyms: government minister |
| minster | (noun) any of certain cathedrals and large churches; originally connected to a monastery | - |
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| misstep | (noun) an unintentional but embarrassing blunder | Synonyms: stumble, trip-up, trip |
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| mobster | (noun) a criminal who is a member of gang | Synonyms: gangster |
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| modiste | (noun) a woman who makes or mends dresses | Synonyms: needlewoman, seamstress, sempstress |
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| (noun) someone who makes and sells hats | Synonyms: hatmaker, hatter, milliner |
| moistener | (noun) a device that dampens or moistens something | Synonyms: dampener |
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| moistening | (noun) the act of making something slightly wet | Synonyms: dampening |
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| molester | (noun) someone who subjects others to unwanted or improper sexual activities | - |
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| monastery | (noun) the residence of a religious community | - |
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| monster | (noun) (medicine) a grossly malformed and usually nonviable fetus | Synonyms: teras |
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| (noun) a cruel wicked and inhuman person | Synonyms: demon, devil, fiend, ogre |
| (noun) a person or animal that is markedly unusual or deformed | Synonyms: freak, lusus naturae, monstrosity |
| (noun) an imaginary creature usually having various human and animal parts | - |
| (noun) someone that is abnormally large and powerful | Synonyms: behemoth, colossus, giant, goliath |
| monstera | (noun) tropical cylindrical fruit resembling a pinecone with pineapple-banana flavor | Synonyms: ceriman |
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| (noun) any plant of the genus Monstera; often grown as houseplants | - |
| mustelid | (noun) fissiped fur-bearing carnivorous mammals | Synonyms: musteline, musteline mammal |
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| musteline | (noun) fissiped fur-bearing carnivorous mammals | Synonyms: mustelid, musteline mammal |
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| muster | (noun) compulsory military service | Synonyms: conscription, draft, selective service |
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| (noun) a gathering of military personnel for duty | - |
| mycosterol | (noun) a kind of sterol found in fungi. | - |
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| mystery | (noun) something that baffles understanding and cannot be explained | Synonyms: closed book, enigma, secret |
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| (noun) a story about a crime (usually murder) presented as a novel or play or movie | Synonyms: mystery story, whodunit |
| nester | (noun) a bird that has built (or is building) a nest | - |
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| (noun) someone who settles lawfully on government land with the intent to acquire title to it | Synonyms: homesteader, squatter |
| newscaster | (noun) someone who broadcasts the news | - |
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| nonexistence | (noun) the state of not existing | Synonyms: nonentity |
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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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| noreaster | (noun) a storm blowing from the northeast | Synonyms: northeaster |
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| northeaster | (noun) a storm blowing from the northeast | Synonyms: noreaster |
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| northwester | (noun) a wind from the northwest | Synonyms: northwest wind |
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| obstetrician | (noun) a physician specializing in obstetrics | Synonyms: accoucheur |
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| obstetrics | (noun) the branch of medicine dealing with childbirth and care of the mother | Synonyms: midwifery, OB, tocology |
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| oersted | (noun) the magnetic field strength 1 cm from a unit magnetic pole | - |
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| oldster | (noun) an elderly person | Synonyms: golden ager, old person, senior citizen |
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| oleaster | (noun) any of several shrubs of the genus Elaeagnus having silver-white twigs and yellow flowers followed by olivelike fruits | - |
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| osteitis | (noun) inflammation of a bone as a consequence of infection or trauma or degeneration | - |
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| ostensibility | (noun) The quality of being professed, supposed rather than demonstrably true or real. | - |
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| ostensorium | (noun) (Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration | Synonyms: monstrance |
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| ostentation | (noun) pretentious or showy or vulgar display | - |
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| (noun) lack of elegance as a consequence of being pompous and puffed up with vanity | Synonyms: inflation, ostentatiousness, pomposity, pompousness, pretentiousness, puffiness, splashiness |
| (noun) a gaudy outward display | Synonyms: fanfare, flash |
| ostentatiousness | (noun) lack of elegance as a consequence of being pompous and puffed up with vanity | Synonyms: inflation, ostentation, pomposity, pompousness, pretentiousness, puffiness, splashiness |
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| osteoarthritis | (noun) chronic breakdown of cartilage in the joints; the most common form of arthritis occurring usually after middle age | Synonyms: degenerative arthritis, degenerative joint disease |
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| osteoblast | (noun) a cell from which bone develops | Synonyms: bone-forming cell |
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| osteoblastoma | (noun) benign tumor of bone and fibrous tissue; occurs in the vertebrae or femur or tibia or arm bones (especially in young adults) | - |
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| osteochondroma | (noun) benign tumor containing both bone and cartilage; usually occurs near the end of a long bone | - |
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| osteoclasis | (noun) treatment of a skeletal deformity by intentionally fracturing a bone | - |
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| osteoclast | (noun) cell that functions in the breakdown and resorption of bone tissue | - |
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| osteocyte | (noun) mature bone cell | - |
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| osteodystrophy | (noun) defective bone development; usually attributable to renal disease or to disturbances in calcium and phosphorus metabolism | - |
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| osteologer | (noun) an anatomist who is skilled in osteology | Synonyms: osteologist |
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| osteologist | (noun) an anatomist who is skilled in osteology | Synonyms: osteologer |
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| osteology | (noun) the branch of anatomy that studies the bones of the vertebrate skeleton | - |
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| osteolysis | (noun) lysis of bone caused by disease or infection or inadequate blood supply | - |
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| osteoma | (noun) a slow growing benign tumor of consisting of bone tissue; usually on the skull or mandible | - |
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| osteomalacia | (noun) abnormal softening of bones caused by deficiencies of phosphorus or calcium or vitamin D | - |
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| osteomyelitis | (noun) an inflammation of bone and bone marrow (usually caused by bacterial infection) | - |
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| osteopath | (noun) a therapist who manipulates the skeleton and muscles | Synonyms: osteopathist |
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| osteopathist | (noun) a therapist who manipulates the skeleton and muscles | Synonyms: osteopath |
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| osteopathy | (noun) therapy based on the assumption that restoring health is best accomplished by manipulating the skeleton and muscles | - |
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| osteopetrosis | (noun) an inherited disorder characterized by an increase in bone density; in severe forms the bone marrow cavity may be obliterated | Synonyms: Albers-Schonberg disease, marble bones disease |
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| osteophyte | (noun) small abnormal bony outgrowth | - |
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| osteoporosis | (noun) abnormal loss of bony tissue resulting in fragile porous bones attributable to a lack of calcium; most common in postmenopausal women | - |
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| osteosarcoma | (noun) malignant bone tumor; most common in children and young adults where it tends to affect the femur | Synonyms: osteogenic sarcoma |
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| osteosclerosis | (noun) abnormal hardening or eburnation of bone | - |
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| osteostracan | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: cephalaspid |
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| osteotomy | (noun) surgical sectioning of bone | - |
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| ouster | (noun) the act of ejecting someone or forcing them out | Synonyms: ousting |
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| (noun) a wrongful dispossession | - |
| (noun) a person who ousts or supplants someone else | Synonyms: ejector |
| outcaste | (noun) a person belonging to no caste | - |
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| oversteer | (noun) when a car turns (steers) by more than (over) the amount commanded by the driver. | - |
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| oyster | (noun) marine mollusks having a rough irregular shell; found on the sea bed mostly in coastal waters | - |
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| (noun) edible body of any of numerous oysters | Synonyms: huitre |
| (noun) a small muscle on each side of the back of a fowl | - |
| oystercatcher | (noun) black-and-white shorebird with stout legs and bill; feed on oysters etc. | Synonyms: oyster catcher |
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| oysterfish | (noun) a variety of toadfish | Synonyms: oyster-fish, oyster fish |
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| palmister | (noun) fortuneteller who predicts your future by the lines on your palms | Synonyms: chiromancer, palmist |
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| panhysterectomy | (noun) surgical removal of the uterus and the ovaries and oviducts and cervix and related lymph nodes | Synonyms: radical hysterectomy |
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| paste | (noun) a tasty mixture to be spread on bread or crackers or used in preparing other dishes | Synonyms: spread |
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| (noun) an adhesive made from water and flour or starch; used on paper and paperboard | Synonyms: library paste |
| (noun) any mixture of a soft and malleable consistency | - |
| (noun) a hard, brilliant lead glass that is used in making artificial jewelry | - |