| medusan | (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusa, medusoid |
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| megatherian | (noun) a large extinct ground sloth | Synonyms: megatherian mammal, megatheriid |
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| melphalan | (noun) antineoplastic drug (trade name Alkeran) used to treat multiple myeloma and some other malignancies | Synonyms: Alkeran |
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| merchantman | (noun) a cargo ship | Synonyms: bottom, freighter, merchant ship |
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| meridian | (noun) an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator | Synonyms: line of longitude |
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| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, peak, pinnacle, summit, superlative, tiptop, top |
| merman | (noun) half man and half fish; lives in the sea | - |
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| metatherian | (noun) primitive pouched mammals found mainly in Australia and the Americas | - |
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| metazoan | (noun) any animal of the subkingdom Metazoa; all animals except protozoans and sponges | - |
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| metropolitan | (noun) a person who lives in a metropolis | - |
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| (noun) in the Eastern Orthodox Church this title is given to a position between bishop and patriarch; equivalent to archbishop in western Christianity | - |
| microradian | (noun) a unit of angular distance equal to one thousandth of a milliradian | - |
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| microsporidian | (noun) parasite of arthropods and fishes that invade and destroy host cells | - |
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| middleman | (noun) a person who is in a position to give you special assistance | Synonyms: contact |
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| (noun) someone who buys large quantities of goods and resells to merchants rather than to the ultimate customers | Synonyms: jobber, wholesaler |
| (noun) the performer in the middle of a minstrel line who engages the others in talk | Synonyms: interlocutor |
| midshipman | (noun) a temporary rank held by young naval officers in training | - |
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| militiaman | (noun) a member of the militia; serves only during emergencies | - |
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| milkman | (noun) someone who delivers milk | - |
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| millenarian | (noun) a person who believes in the coming of the millennium (a time of great peace and prosperity) | Synonyms: chiliast, millenarist |
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| milliradian | (noun) a unit of angular distance equal to one thousandth of a radian | - |
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| minivan | (noun) a small box-shaped passenger van; usually has removable seats; used as a family car | - |
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| minyan | (noun) the quorum required by Jewish law to be present for public worship (at least ten males over thirteen years of age) | - |
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| mithan | (noun) ox of southeast Asia sometimes considered a domesticated breed of the gaur | Synonyms: Bibos frontalis, gayal |
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| moan | (noun) an utterance expressing pain or disapproval | Synonyms: groan |
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| moneran | (noun) organisms that typically reproduce by asexual budding or fission and whose nutritional mode is absorption or photosynthesis or chemosynthesis | Synonyms: moneron |
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| moneyman | (noun) a person skilled in large scale financial transactions | Synonyms: financier |
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| mortician | (noun) one whose business is the management of funerals | Synonyms: funeral director, funeral undertaker, undertaker |
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| motorman | (noun) the operator of streetcar | - |
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| mulligan | (noun) Irish version of burgoo | Synonyms: Irish burgoo, mulligan stew |
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| muscleman | (noun) a bully employed as a thug or bodyguard | Synonyms: muscle |
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| (noun) someone who does special exercises to develop a brawny musculature | Synonyms: bodybuilder, muscle-builder, muscle builder, musclebuilder |
| musician | (noun) artist who composes or conducts music as a profession | - |
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| (noun) someone who plays a music as a profession | Synonyms: instrumentalist, player |
| myrobalan | (noun) small Asiatic tree bearing edible red or yellow fruit | Synonyms: cherry plum, myrobalan plum, Prunus cerasifera |
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| myxosporidian | (noun) mostly parasitic in fishes and including various serious pathogens | - |
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| naan | (noun) leavened bread baked in a clay oven in India; usually shaped like a teardrop | Synonyms: nan |
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| nan | (noun) leavened bread baked in a clay oven in India; usually shaped like a teardrop | Synonyms: naan |
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| (noun) your grandmother | - |
| (noun) the mother of your father or mother | Synonyms: gran, grandma, grandmother, grannie, granny, nanna |
| necessitarian | (noun) someone who does not believe the doctrine of free will | - |
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| needlewoman | (noun) a woman who makes or mends dresses | Synonyms: modiste, seamstress, sempstress |
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| nemertean | (noun) soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract | Synonyms: nemertine, proboscis worm, ribbon worm |
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| neuropteran | (noun) insect having biting mouthparts and four large membranous wings with netlike veins | Synonyms: neuropteron, neuropterous insect |
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| newsman | (noun) a male person who investigates and reports or edits news stories | - |
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| newspaperman | (noun) a male journalist employed to provide news stories for newspapers or broadcast media | Synonyms: pressman |
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| newspaperwoman | (noun) a female journalist employed to provide news stories for newspapers or broadcast media | - |
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| newswoman | (noun) a female newsperson | - |
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| nitrofuran | (noun) derivative of furan used to inhibit bacterial growth | - |
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| nobleman | (noun) a titled peer of the realm | Synonyms: Lord, noble |
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| noblewoman | (noun) a woman of the peerage in Britain | Synonyms: Lady, peeress |
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| nonagenarian | (noun) someone whose age is in the nineties | - |
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| nonpartisan | (noun) a person who is nonpartisan | Synonyms: nonpartizan |
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| nonpartizan | (noun) a person who is nonpartisan | Synonyms: nonpartisan |
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| nurseryman | (noun) someone who takes care of a garden | Synonyms: gardener |
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| oarsman | (noun) a male who rows a boat | - |
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| oarswoman | (noun) a woman oarsman | - |
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| obsidian | (noun) acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces | - |
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| obstetrician | (noun) a physician specializing in obstetrics | Synonyms: accoucheur |
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| ocean | (noun) a large body of water constituting a principal part of the hydrosphere | - |
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| (noun) anything apparently limitless in quantity or volume | Synonyms: sea |
| octogenarian | (noun) someone whose age is in the eighties | - |
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| oilcan | (noun) a can with a long nozzle to apply oil to machinery | - |
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| oilman | (noun) a worker who produces or sells petroleum | - |
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| (noun) a person who owns or operates oil wells | - |
| ombudsman | (noun) a government appointee who investigates complaints by private persons against the government | - |
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| 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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| ophidian | (noun) limbless scaly elongate reptile; some are venomous | Synonyms: serpent, snake |
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| optician | (noun) a worker who makes glasses for remedying defects of vision | Synonyms: lens maker |
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| orangutan | (noun) large long-armed ape of Borneo and Sumatra having arboreal habits | Synonyms: orang, orangutang, Pongo pygmaeus |
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| organ | (noun) wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard | Synonyms: pipe organ |
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| (noun) (music) an electronic simulation of a pipe organ | Synonyms: electric organ, electronic organ, Hammond organ |
| (noun) a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows | Synonyms: harmonium, reed organ |
| (noun) a fully differentiated structural and functional unit in an animal that is specialized for some particular function | - |
| (noun) a periodical that is published by a special interest group | - |
| (noun) a government agency or instrument devoted to the performance of some specific function | - |
| ornithischian | (noun) herbivorous dinosaur with a pelvis like that of a bird | Synonyms: ornithischian dinosaur |
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| orphan | (noun) a young animal without a mother | - |
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| (noun) the first line of a paragraph that is set as the last line of a page or column | - |
| (noun) a child who has lost both parents | - |
| (noun) someone or something who lacks support or care or supervision | - |
| orthopteran | (noun) any of various insects having leathery forewings and membranous hind wings and chewing mouthparts | Synonyms: orthopteron, orthopterous insect |
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| ortolan | (noun) brownish Old World bunting often eaten as a delicacy | Synonyms: Emberiza hortulana, ortolan bunting |
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| ortygan | (noun) any of several East Indian birds | - |
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| osteostracan | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: cephalaspid |
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| ottoman | (noun) thick cushion used as a seat | Synonyms: hassock, pouf, pouffe, puff |
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| (noun) a low seat or a stool to rest the feet of a seated person | Synonyms: footrest, footstool, tuffet |
| outdoorsman | (noun) a male person who spends time outdoors (e.g., hunting or fishing) | - |
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| outdoorswoman | (noun) a woman who spends time outdoors (e.g., hunting and fishing) | - |
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| packman | (noun) someone who travels about selling his wares (as on the streets or at carnivals) | Synonyms: hawker, peddler, pedlar, pitchman |
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| paean | (noun) a formal expression of praise | Synonyms: encomium, eulogy, panegyric, pean |
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| (noun) (ancient Greece) a hymn of praise (especially one sung in ancient Greece to invoke or thank a deity) | Synonyms: pean |
| paediatrician | (noun) a specialist in the care of babies | Synonyms: baby doctor, pediatrician, pediatrist |
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| pagan | (noun) a person who does not acknowledge your god | Synonyms: gentile, heathen, infidel |
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| (noun) a person who follows a polytheistic or pre-Christian religion (not a Christian or Muslim or Jew) | - |
| (noun) someone motivated by desires for sensual pleasures | Synonyms: hedonist, pleasure seeker |
| pan | (noun) shallow container made of metal | - |
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| (noun) cooking utensil consisting of a wide metal vessel | Synonyms: cooking pan |
| pantryman | (noun) a manservant (usually the head servant of a household) who has charge of wines and the table | Synonyms: butler |
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| parazoan | (noun) primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies | Synonyms: poriferan, sponge |
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| parliamentarian | (noun) an expert in parliamentary rules and procedures | - |
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| partisan | (noun) a pike with a long tapering double-edged blade with lateral projections; 16th and 17th centuries | Synonyms: partizan |
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| (noun) a fervent and even militant proponent of something | Synonyms: drumbeater, zealot |
| (noun) an ardent and enthusiastic supporter of some person or activity | Synonyms: enthusiast, partizan |
| partizan | (noun) a pike with a long tapering double-edged blade with lateral projections; 16th and 17th centuries | Synonyms: partisan |
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| (noun) an ardent and enthusiastic supporter of some person or activity | Synonyms: enthusiast, partisan |
| patrician | (noun) a member of the aristocracy | Synonyms: aristocrat, blue blood |
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| (noun) a person of refined upbringing and manners | - |
| patrolman | (noun) a policeman who patrols a given region | Synonyms: flatfoot |
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| pavan | (noun) a stately court dance of the 16th and 17th centuries | Synonyms: pavane |
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| (noun) music composed for dancing the pavane | Synonyms: pavane |
| pean | (noun) a formal expression of praise | Synonyms: encomium, eulogy, paean, panegyric |
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| (noun) (ancient Greece) a hymn of praise (especially one sung in ancient Greece to invoke or thank a deity) | Synonyms: paean |
| pecan | (noun) smooth brown oval nut of south central United States | - |
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| (noun) tree of southern United States and Mexico cultivated for its nuts | Synonyms: Carya illinoensis, Carya illinoinsis, pecan tree |
| (noun) wood of a pecan tree | - |
| pedestrian | (noun) a person who travels by foot | Synonyms: footer, walker |
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| pediatrician | (noun) a specialist in the care of babies | Synonyms: baby doctor, paediatrician, pediatrist |
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| pekan | (noun) large dark brown North American arboreal carnivorous mammal | Synonyms: black cat, fisher, fisher cat, Martes pennanti |
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| pelican | (noun) large long-winged warm-water seabird having a large bill with a distensible pouch for fish | - |
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| pemican | (noun) lean dried meat pounded fine and mixed with melted fat; used especially by North American Indians | Synonyms: pemmican |
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| pemmican | (noun) lean dried meat pounded fine and mixed with melted fat; used especially by North American Indians | Synonyms: pemican |
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| penman | (noun) informal terms for journalists | Synonyms: scribbler, scribe |
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| percoidean | (noun) any of numerous spiny-finned fishes of the order Perciformes | Synonyms: percoid, percoid fish |
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| peridinian | (noun) flagellate with a thick test composed of plates | - |
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| pesantran | (noun) a Muslim school in Indonesia operated by religious leaders | Synonyms: pesantren |
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| phonetician | (noun) a specialist in phonetics | - |
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| photometrician | (noun) someone who practices photometry | Synonyms: photometrist |
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| physician | (noun) a licensed medical practitioner | Synonyms: doc, doctor, Dr., MD, medico |
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| pigman | (noun) a herder or swine | Synonyms: swineherd |
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| pitchman | (noun) someone who travels about selling his wares (as on the streets or at carnivals) | Synonyms: hawker, packman, peddler, pedlar |
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| (noun) an aggressive salesman who uses a fast line of talk to sell something | - |