| methyl | (noun) the univalent radical CH3- derived from methane | Synonyms: methyl group, methyl radical |
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| methylated | (adjective) having received a methyl group | - |
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| methylbenzene | (noun) a colorless flammable liquid obtained from petroleum or coal tar; used as a solvent for gums and lacquers and in high-octane fuels | Synonyms: toluene |
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| methyldopa | (noun) antihypertensive drug (trade name Aldomet) used in the treatment of high blood pressure | Synonyms: Aldomet, alpha methyl dopa |
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| methylene | (noun) the bivalent radical CH2 derived from methane | Synonyms: methylene group, methylene radical |
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| methylenedioxymethamphetamine | (noun) a stimulant drug that is chemically related to mescaline and amphetamine and is used illicitly for its euphoric and hallucinogenic effects; it was formerly used in psychotherapy but in 1985 it was declared illegal in the United States | Synonyms: MDMA |
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| methylphenidate | (noun) central nervous system stimulant (trade name Ritalin) used in the treatment of narcolepsy in adults and attention deficit disorder in children | Synonyms: Ritalin |
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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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| microgametophyte | (noun) the male gametophyte produced by a microspore | - |
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| microsporophyll | (noun) in non-flowering plants, a sporophyll that bears only microsporangia | - |
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| monarchy | (noun) an autocracy governed by a monarch who usually inherits the authority | - |
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| 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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| monohydrate | (noun) a hydrate that contains one molecule of water per molecule of the compound | - |
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| mononeuropathy | (noun) any neuropathy of a single nerve trunk | - |
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| morphophysiology | (noun) the study of anatomy in its relation to function | Synonyms: functional anatomy, physiological anatomy |
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| mothy | (adjective) infested with moths | - |
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| (adjective) worn or eaten away by (or as if by) moths | Synonyms: moth-eaten |
| murphy | (noun) an edible tuber native to South America; a staple food of Ireland | Synonyms: Irish potato, potato, spud, tater, white potato |
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| mushy | (adjective) effusively or insincerely emotional | Synonyms: bathetic, drippy, hokey, kitschy, maudlin, mawkish, sappy, schmaltzy, schmalzy, sentimental, slushy, soppy, soupy |
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| (adjective) having the consistency of mush | - |
| myelography | (noun) roentgenography of the spinal cord to detect possible lesions (usually after injection of a contrast medium into the subarachnoid space) | - |
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| myocardiopathy | (noun) a disorder (usually of unknown origin) of the heart muscle (myocardium) | Synonyms: cardiomyopathy |
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| myopathy | (noun) any pathology of the muscles that is not attributable to nerve dysfunction | - |
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| myrmecophyte | (noun) plant that affords shelter or food to ants that live in symbiotic relations with it | - |
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| myrmecophytic | (adjective) of or relating to myrmecophytes | - |
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| naprapathy | (noun) a drugless method of treatment based on the belief that disease symptoms arise from problems with ligaments and connective tissues | - |
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| naturopathy | (noun) a method of treating disease using food and exercise and heat to assist the natural healing process | - |
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| naumachy | (noun) a naval spectacle; a mock sea battle put on by the ancient Romans | Synonyms: naumachia |
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| neophyte | (noun) any new participant in some activity | Synonyms: entrant, fledgeling, fledgling, freshman, newbie, newcomer, starter |
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| (noun) a new convert being taught the principles of Christianity by a catechist | Synonyms: catechumen |
| (noun) a plant that is found in an area where it had not been recorded previously | - |
| nephropathy | (noun) a disease affecting the kidneys | Synonyms: kidney disease, nephrosis, renal disorder |
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| nephthytis | (noun) any plant of the genus Nephthytis | - |
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| neurohypophysis | (noun) the posterior lobe of the pituitary body; primarily glandular in nature | Synonyms: pars nervosa, posterior pituitary, posterior pituitary gland |
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| neuropathy | (noun) any pathology of the peripheral nerves | - |
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| neurophysiological | (adjective) of or concerned with neurophysiology | - |
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| neurophysiology | (noun) the branch of neuroscience that studies the physiology of the nervous system | - |
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| newsworthy | (adjective) sufficiently interesting to be reported in a newspaper | - |
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| nonphysical | (adjective) lacking substance or reality; incapable of being touched or seen | Synonyms: intangible |
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| nonrhythmic | (adjective) deliberately not rhythmic | - |
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| norethynodrel | (noun) a progesterone derivative used in oral contraceptives and in the control of menstruation and the treatment of abnormal uterine bleeding | - |
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| noteworthy | (adjective) worthy of attention | Synonyms: notable, remarkable |
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| oceanography | (noun) the branch of science dealing with physical and biological aspects of the oceans | Synonyms: oceanology |
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| oleography | (noun) the art or process of producing chromolithographs printed on cloth to imitate an oil painting. | - |
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| oligarchy | (noun) a political system governed by a few people | - |
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| orography | (noun) the science of mountains | Synonyms: orology |
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| orthography | (noun) a method of representing the sounds of a language by written or printed symbols | Synonyms: writing system |
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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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| osteopathy | (noun) therapy based on the assumption that restoring health is best accomplished by manipulating the skeleton and muscles | - |
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| osteophyte | (noun) small abnormal bony outgrowth | - |
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| pachycephalosaur | (noun) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found | Synonyms: pachycephalosaurus |
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| pachycephalosaurus | (noun) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found | Synonyms: pachycephalosaur |
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| pachycheilia | (noun) an abnormal thickness of the lips | - |
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| pachyderm | (noun) any of various nonruminant hoofed mammals having very thick skin: elephant, rhinoceros, hippopotamus | - |
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| pachyderma | (noun) thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction | Synonyms: nevoid elephantiasis |
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| pachydermal | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermatous, pachydermic, pachydermous |
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| pachydermatous | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermal, pachydermic, pachydermous |
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| (adjective) emotionally hardened | Synonyms: callous, indurate |
| pachydermic | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermal, pachydermatous, pachydermous |
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| pachydermous | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermal, pachydermatous, pachydermic |
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| pachysandra | (noun) any plant of the genus Pachysandra; low-growing evergreen herbs or subshrubs having dentate leaves and used as ground cover | - |
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| pachytene | (noun) the third stage of the prophase of meiosis | - |
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| palaeoethnography | (noun) the ethnography of paleolithic humans | Synonyms: paleoethnography |
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| palaeogeography | (noun) the study of the geography of ancient times or ancient epochs | Synonyms: paleogeography |
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| paleoethnography | (noun) the ethnography of paleolithic humans | Synonyms: palaeoethnography |
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| paleogeography | (noun) the study of the geography of ancient times or ancient epochs | Synonyms: palaeogeography |
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| paleography | (noun) the study of ancient forms of writing (and the deciphering of them) | - |
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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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| paraldehyde | (noun) a colorless liquid (a cyclic trimer of acetaldehyde) that is used as a sedative and a solvent | Synonyms: ethanal trimer |
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| paraphysis | (noun) a sterile simple or branched filament or hair borne among sporangia; may be pointed or clubbed | - |
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| parathyroid | (noun) any one of four endocrine glands situated above or within the thyroid gland | Synonyms: parathyroid gland |
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| parenchyma | (noun) animal tissue that constitutes the essential part of an organ as contrasted with e.g. connective tissue and blood vessels | - |
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| (noun) the primary tissue of higher plants composed of thin-walled cells that remain capable of cell division even when mature; constitutes the greater part of leaves, roots, the pulp of fruits, and the pith of stems | - |
| pataphysics | (noun) a philosophy or media theory dedicated to studying what lies beyond the realm of metaphysics. | - |
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| patchy | (adjective) irregular or uneven in quality, texture, etc. | - |
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| patriarchy | (noun) a form of social organization in which a male is the family head and title is traced through the male line | Synonyms: patriarchate |
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| paunchy | (adjective) having a large belly | Synonyms: abdominous, potbellied |
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| peachy | (adjective) of something resembling a peach in color | Synonyms: peachy-colored, peachy-coloured |
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| (adjective) excellent | Synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, old, slap-up, smashing, swell |
| pentamethylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentylenetetrazol |
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| phenylethylene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, styrene, vinylbenzene |
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| philosophy | (noun) the rational investigation of questions about existence and knowledge and ethics | - |
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| (noun) a belief (or system of beliefs) accepted as authoritative by some group or school | Synonyms: doctrine, ism, philosophical system, school of thought |
| (noun) any personal belief about how to live or how to deal with a situation | - |
| photography | (noun) the act of taking and printing photographs | Synonyms: picture taking |
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| (noun) the occupation of taking and printing photographs or making movies | - |
| (noun) the process of producing images of objects on photosensitive surfaces | - |
| photolithography | (noun) a planographic printing process using plates made from a photographic image | - |
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| phototelegraphy | (noun) an early technology for the transmission of facsimiles. | - |
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| phycobilin | (noun) water-soluble proteinaceous pigments found in red algae and cyanobacteria | - |
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| phycocyanin | (noun) blue pigment in algae | - |
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| phycoerythrin | (noun) red pigment in red algae | - |
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| phycology | (noun) the branch of botany that studies algae | Synonyms: algology |
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| phycomycosis | (noun) any fungal infection caused by fungi of the Phycomycetes group | - |
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| phylactery | (noun) (Judaism) either of two small leather cases containing texts from the Hebrew Scriptures (known collectively as tefillin); traditionally worn (on the forehead and the left arm) by Jewish men during morning prayer | Synonyms: tefillin |
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| phyle | (noun) a tribe of ancient Athenians | - |
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| phyletic | (adjective) of or relating to the evolutionary development of organisms | Synonyms: phylogenetic |
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| phylliform | (adjective) having the shape of a leaf | - |
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| phyllo | (noun) tissue thin sheets of pastry used especially in Greek dishes | - |
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| phylloclad | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladode, cladophyll, phylloclade |
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| phylloclade | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladode, cladophyll, phylloclad |
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| phyllode | (noun) an expanded petiole taking on the function of a leaf blade | - |
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| phyllodial | (adjective) having a phyllode | - |
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| phylloquinone | (noun) a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent | Synonyms: phytonadione, vitamin K1 |
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| phylogenesis | (noun) (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms | Synonyms: evolution, organic evolution, phylogeny |
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| phylogenetic | (adjective) of or relating to the evolutionary development of organisms | Synonyms: phyletic |
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| phylogenetically | (adverb) with regard to phylogeny | - |
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| phylogeny | (noun) (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms | Synonyms: evolution, organic evolution, phylogenesis |
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| phylum | (noun) (biology) the major taxonomic group of animals and plants; contains classes | - |
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| (noun) (linguistics) a large group of languages that are historically related | - |
| physa | (noun) any member of the genus Physa | - |
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| physiatrics | (noun) therapy that uses physical agents: exercise and massage and other modalities | Synonyms: physical therapy, physiotherapy |
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