| infusorian | (noun) any member of the subclass Infusoria | - |
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| isthmian | (adjective) of or relating to or forming an isthmus | - |
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| kalian | (noun) an oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water | Synonyms: calean, chicha, hookah, hubble-bubble, hubbly-bubbly, narghile, nargileh, sheesha, shisha, water pipe |
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| labyrinthian | (adjective) resembling a labyrinth in form or complexity | Synonyms: labyrinthine, mazy |
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| lacertilian | (adjective) of or relating to lizards | Synonyms: saurian |
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| lapidarian | (adjective) inscribed on stone | - |
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| latitudinarian | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, undogmatic, undogmatical |
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| (noun) a person who is broad-minded and tolerant (especially in standards of religious belief and conduct) | - |
| leptorrhinian | (adjective) having a long narrow nose | Synonyms: leptorhine, leptorrhine, leptorrhinic |
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| lesbian | (adjective) of or relating to or characterized by homosexual relations between woman | Synonyms: sapphic |
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| (noun) a female homosexual | Synonyms: gay woman, tribade |
| libertarian | (noun) someone who believes the doctrine of free will | - |
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| (noun) an advocate of libertarianism | - |
| librarian | (noun) a professional person trained in library science and engaged in library services | Synonyms: bibliothec |
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| lilliputian | (adjective) very small | Synonyms: bantam, diminutive, flyspeck, midget, petite, tiny |
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| (adjective) (informal) small and of little importance | Synonyms: fiddling, footling, little, niggling, petty, picayune, piddling, piffling, trivial |
| (noun) a very small person (resembling a Lilliputian) | - |
| logician | (noun) a person skilled at logic | Synonyms: logistician |
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| logistician | (noun) a person skilled at logic | Synonyms: logician |
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| magician | (noun) one who practices magic or sorcery | Synonyms: necromancer, sorcerer, thaumaturge, thaumaturgist, wizard |
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| (noun) someone who performs magic tricks to amuse an audience | Synonyms: conjurer, conjuror, illusionist, prestidigitator |
| malacopterygian | (noun) any fish of the superorder Malacopterygii | Synonyms: soft-finned fish |
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| mammalian | (adjective) of or relating to the class Mammalia | - |
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| (noun) any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk | Synonyms: mammal |
| marginocephalian | (noun) includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs | Synonyms: Marginocephalia, suborder Marginocephalia |
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| mathematician | (noun) a person skilled in mathematics | - |
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| median | (adjective) relating to or situated in or extending toward the middle | Synonyms: medial |
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| (adjective) dividing an animal into right and left halves | Synonyms: medial |
| (adjective) relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values) | Synonyms: average |
| (noun) the number midway between the two middle numbers in a series containing an even or odd number of items | Synonyms: median value |
| megatherian | (noun) a large extinct ground sloth | Synonyms: megatherian mammal, megatheriid |
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| mephistophelian | (adjective) showing the cunning or ingenuity or wickedness typical of a devil | Synonyms: devilish, diabolic, diabolical, mephistophelean |
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| meridian | (adjective) of or happening at noon | - |
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| (adjective) being at the best stage of development | Synonyms: prime |
| (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 |
| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, peak, pinnacle, summit, superlative, tiptop, top |
| metatherian | (noun) primitive pouched mammals found mainly in Australia and the Americas | - |
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| 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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| millenarian | (adjective) relating to or believing in the millennium of peace and happiness | Synonyms: chiliastic |
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| (noun) a person who believes in the coming of the millennium (a time of great peace and prosperity) | Synonyms: chiliast, millenarist |
| millennian | (adjective) relating to a millennium or span of a thousand years | Synonyms: millennial |
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| milliradian | (noun) a unit of angular distance equal to one thousandth of a radian | - |
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| mortician | (noun) one whose business is the management of funerals | Synonyms: funeral director, funeral undertaker, undertaker |
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| 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 |
| myxosporidian | (noun) mostly parasitic in fishes and including various serious pathogens | - |
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| necessitarian | (noun) someone who does not believe the doctrine of free will | - |
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| nonagenarian | (adjective) being from 90 to 99 years old | - |
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| (noun) someone whose age is in the nineties | - |
| nonchristian | (adjective) not believing in Christ | Synonyms: christless |
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| nonsectarian | (adjective) not restricted to one sect or school or party | Synonyms: unsectarian |
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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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| octogenarian | (adjective) being from 80 to 89 years old | - |
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| (noun) someone whose age is in the eighties | - |
| olympian | (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, exceptional, prodigious, surpassing |
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| (adjective) majestic in manner or bearing; superior to mundane matters | Synonyms: majestic |
| 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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| ornithischian | (noun) herbivorous dinosaur with a pelvis like that of a bird | Synonyms: ornithischian dinosaur |
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| ovarian | (adjective) of or involving the ovaries | - |
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| paediatrician | (noun) a specialist in the care of babies | Synonyms: baby doctor, pediatrician, pediatrist |
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| parliamentarian | (noun) an expert in parliamentary rules and procedures | - |
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| patrician | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, aristocratical, blue-blooded, blue, gentle |
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| (adjective) befitting a person of noble origin | - |
| (noun) a member of the aristocracy | Synonyms: aristocrat, blue blood |
| (noun) a person of refined upbringing and manners | - |
| pedestrian | (adjective) lacking wit or imagination | Synonyms: earthbound, prosaic, prosy |
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| (noun) a person who travels by foot | Synonyms: footer, walker |
| pediatrician | (noun) a specialist in the care of babies | Synonyms: baby doctor, paediatrician, pediatrist |
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| peridinian | (noun) flagellate with a thick test composed of plates | - |
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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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| planarian | (noun) free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts | Synonyms: planaria |
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| platitudinarian | (noun) a bore who makes excessive use of platitudes | - |
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| platyrhinian | (adjective) of or related to New World monkeys having nostrils far apart or to people with broad noses | Synonyms: broadnosed, platyrhine, platyrrhine, platyrrhinian, platyrrhinic |
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| platyrrhinian | (adjective) of or related to New World monkeys having nostrils far apart or to people with broad noses | Synonyms: broadnosed, platyrhine, platyrhinian, platyrrhine, platyrrhinic |
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| (noun) hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails | Synonyms: New World monkey, platyrrhine |
| plebeian | (adjective) of or associated with the great masses of people | Synonyms: common, unwashed, vulgar |
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| (noun) one of the common people | Synonyms: pleb |
| politician | (noun) a person active in party politics | Synonyms: pol, political leader, politico |
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| (noun) a leader engaged in civil administration | - |
| (noun) a schemer who tries to gain advantage in an organization in sly or underhanded ways | - |
| postdiluvian | (adjective) existing or occurring after Noah's flood | - |
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| (noun) anything living after Noah's flood | - |
| postmeridian | (adjective) after midday | - |
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| practician | (noun) someone who practices a learned profession | Synonyms: practitioner |
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| praetorian | (adjective) of or relating to a Roman praetor | Synonyms: praetorial, pretorial, pretorian |
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| predestinarian | (adjective) of or relating to predestination; holding the doctrine of predestination | - |
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| (noun) anyone who submits to the belief that they are powerless to change their destiny | Synonyms: determinist, fatalist, predestinationist |
| prelapsarian | (adjective) of or relating to the time before the Fall of Adam and Eve | - |
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| pretorian | (adjective) of or relating to a Roman praetor | Synonyms: praetorial, praetorian, pretorial |
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| proboscidian | (noun) massive herbivorous mammals having tusks and a long trunk | Synonyms: proboscidean |
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| proletarian | (adjective) belonging to or characteristic of the proletariat | - |
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| (noun) a member of the working class (not necessarily employed) | Synonyms: prole, worker |
| prosimian | (noun) primitive primates having large ears and eyes and characterized by nocturnal habits | - |
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| prototherian | (noun) primitive oviparous mammals found only in Australia and Tasmania and New Guinea | - |
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| quotidian | (adjective) found in the ordinary course of events | Synonyms: everyday, mundane, routine, unremarkable, workaday |
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| radian | (noun) the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) | Synonyms: rad |
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| radiolarian | (noun) protozoa with amoeba-like bodies and radiating filamentous pseudopods | - |
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| reptilian | (adjective) of or relating to the class Reptilia | - |
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| (noun) any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms | Synonyms: reptile |
| rhetorician | (noun) a person who delivers a speech or oration | Synonyms: orator, public speaker, speechifier, speechmaker |
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| riparian | (adjective) of or relating to or located on the banks of a river or stream | - |
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| ruffian | (noun) a cruel and brutal fellow | Synonyms: bully, hooligan, roughneck, rowdy, tough, yob, yobbo, yobo |
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| salientian | (adjective) relating to frogs and toads | Synonyms: anuran, batrachian |
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| (noun) any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species | Synonyms: anuran, batrachian, frog, toad, toad frog |
| salutatorian | (noun) a graduating student with the second highest academic rank; may deliver the opening address at graduation exercises | Synonyms: salutatory speaker |
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| sarcocystieian | (noun) parasite of the muscles of vertebrates | Synonyms: sarcocystidean, sarcosporidian |
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| sarcodinian | (noun) protozoa that move and capture food by forming pseudopods | Synonyms: sarcodine |
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| sarcosporidian | (noun) parasite of the muscles of vertebrates | Synonyms: sarcocystidean, sarcocystieian |
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| saurian | (adjective) of or relating to lizards | Synonyms: lacertilian |
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| (noun) any of various reptiles of the suborder Sauria which includes lizards; in former classifications included also the crocodiles and dinosaurs | - |
| saurischian | (noun) herbivorous or carnivorous dinosaur having a three-pronged pelvis like that of a crocodile | Synonyms: saurischian dinosaur |
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| sectarian | (adjective) of or relating to or characteristic of a sect or sects | - |
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| (noun) a member of a sect | Synonyms: sectarist, sectary |
| selachian | (noun) any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks, rays, skates | Synonyms: elasmobranch |
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| seminarian | (noun) a student at a seminary (especially a Roman Catholic seminary) | Synonyms: seminarist |
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| semiotician | (noun) a specialist in the study of meaning | Synonyms: semanticist |
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| septuagenarian | (noun) someone whose age is in the seventies | - |
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| sertularian | (noun) feathery colony of long-branched stems bearing stalkless paired polyps | - |
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| sesquipedalian | (adjective) (of words) long and ponderous; having many syllables | Synonyms: polysyllabic |
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| (adjective) given to the overuse of long words | - |
| (noun) a very long word (a foot and a half long) | Synonyms: sesquipedalia |
| sexagenarian | (adjective) being from 60 to 69 years old | - |
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| (noun) someone whose age is in the sixties | - |
| simian | (adjective) relating to or resembling an ape | - |
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| (noun) an ape or monkey | - |
| sirenian | (noun) any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs | Synonyms: sea cow, sirenian mammal |
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| solitudinarian | (noun) one who lives in solitude | Synonyms: hermit, recluse, solitary, troglodyte |
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| statistician | (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) | Synonyms: actuary |
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| (noun) a mathematician who specializes in statistics | Synonyms: mathematical statistician |
| stentorian | (adjective) (used of the voice or sound) deep and resonant | Synonyms: booming |
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| steradian | (noun) the unit of solid angle adopted under the Systeme International d'Unites | Synonyms: sr |
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| strategian | (noun) an expert in strategy (especially in warfare) | Synonyms: strategist |
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| subartesian | (adjective) (of water) rising naturally in a well to a height appreciably above that of the surrounding water table but not flowing out of the well | - |
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