| motoneuron | (noun) a neuron conducting impulses outwards from the brain or spinal cord | Synonyms: efferent neuron, motor nerve fiber, motor neuron |
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| mouton | (noun) meat from a mature domestic sheep | Synonyms: mutton |
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| muton | (noun) the smallest unit of DNA where a mutation can occur | - |
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| mutton | (noun) meat from a mature domestic sheep | Synonyms: mouton |
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| muttonfish | (noun) similar to and often marketed as `red snapper' | Synonyms: Lutjanus analis, mutton snapper |
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| muttonhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, numskull, shithead |
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| myotonia | (noun) abnormally long muscular contractions; slow relaxation of a muscle after a contraction | - |
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| myotonic | (adjective) of or relating to or caused by myotonia | - |
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| nabumetone | (noun) a nonsteroidal anti-inflammatory drug (trade name Relafen) | Synonyms: Relafen |
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| nanoplankton | (noun) microscopic organisms found in plankton | - |
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| nekton | (noun) the aggregate of actively swimming animals in a body of water ranging from microscopic organisms to whales | - |
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| neotony | (noun) the state resulting when juvenile characteristics are retained by the adults of a species | - |
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| newton | (noun) a unit of force equal to the force that imparts an acceleration of 1 m/sec/sec to a mass of 1 kilogram; equal to 100,000 dynes | Synonyms: N |
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| nitrocotton | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocellulose |
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| nonautonomous | (adjective) (of peoples and political bodies) controlled by outside forces | Synonyms: nonsovereign |
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| nonmonotonic | (adjective) not monotonic | - |
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| octonary | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octad, octet, ogdoad, VIII |
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| oilstone | (noun) a whetstone for use with oil | - |
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| opisthotonos | (noun) severe spasm in which the back arches and the head bends back and heels flex toward the back | - |
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| overtone | (noun) a harmonic with a frequency that is a multiple of the fundamental frequency | Synonyms: partial, partial tone |
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| (noun) (usually plural) an ulterior implicit meaning or quality | - |
| oxtongue | (noun) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States | Synonyms: bitterweed, bristly oxtongue, bugloss, Picris echioides |
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| oxytone | (noun) word having stress or an acute accent on the last syllable | - |
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| paroxytone | (noun) word having stress or acute accent on the next to last syllable | - |
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| pentatone | (noun) a gapped scale with five notes; usually the fourth and seventh notes of the diatonic scale are omitted | Synonyms: pentatonic scale |
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| pentatonic | (adjective) relating to a pentatonic scale | - |
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| peptone | (noun) any of various water-soluble compounds that form by hydrolysis in the digestion of proteins to amino acids | - |
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| peritoneal | (adjective) of or relating to or affecting the peritoneum | - |
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| peritoneum | (noun) a transparent membrane that lines the abdominal cavity in mammals and covers most of the viscera | - |
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| peritonitis | (noun) inflammation of the peritoneum | Synonyms: peritoneal inflammation |
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| phaeton | (noun) large open car seating four with folding top | Synonyms: tourer, touring car |
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| phenobarbitone | (noun) a long-acting barbiturate used as a sedative | Synonyms: Luminal, phenobarbital, purple heart, sodium thiopental |
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| phenylketonuria | (noun) a genetic disorder of metabolism; lack of the enzyme needed to turn phenylalanine into tyrosine results in an accumulation of phenylalanine in the body fluids which causes various degrees of mental deficiency | Synonyms: PKU |
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| phlogiston | (noun) a hypothetical substance once believed to be present in all combustible materials and to be released during burning | - |
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| photon | (noun) a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle | - |
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| phytonadione | (noun) a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent | Synonyms: phylloquinone, vitamin K1 |
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| phytoplankton | (noun) photosynthetic or plant constituent of plankton; mainly unicellular algae | - |
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| piston | (noun) mechanical device that has a plunging or thrusting motion | Synonyms: plunger |
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| pistonphone | (noun) an acoustical calibrator (sound source) that uses a closed coupling volume to generate a precise sound pressure for the calibration of measurement microphones. | - |
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| pitchstone | (noun) dark acid granitic glass | - |
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| piton | (noun) a metal spike with a hole for a rope; mountaineers drive it into ice or rock to use as a hold | - |
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| plankton | (noun) the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water | - |
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| planktonic | (adjective) of or relating to plankton | - |
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| platonic | (adjective) free from physical desire | - |
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| pluton | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholite, batholith, plutonic rock |
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| plutonic | (adjective) of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro | Synonyms: irruptive |
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| plutonium | (noun) a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239 | Synonyms: atomic number 94, Pu |
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| polyptoton | (noun) repetition of a word in a different case or inflection in the same sentence | - |
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| polysyndeton | (noun) using several conjunctions in close succession, especially where some might be omitted (as in `he ran and jumped and laughed for joy') | - |
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| polytonal | (adjective) using more than one key or tonality simultaneously | - |
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| polytonalism | (noun) music that uses two or more different keys at the same time | Synonyms: polytonality |
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| polytonality | (noun) music that uses two or more different keys at the same time | Synonyms: polytonalism |
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| potamoplankton | (noun) plankton that inhabit rivers | - |
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| proparoxytone | (noun) word having stress or acute accent on the antepenult | - |
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| proton | (noun) a stable particle with positive charge equal to the negative charge of an electron | - |
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| psilophyton | (noun) any plant or fossil of the genus Psilophyton | - |
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| quantong | (noun) red Australian fruit; used for dessert or in jam | Synonyms: native peach, quandang, quandong |
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| rhinestone | (noun) an imitation diamond made from rock crystal or glass or paste | - |
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| rigatoni | (noun) tubular pasta in short ribbed pieces | - |
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| ritonavir | (noun) a protease inhibitor (trade name Norvir) used in treating HIV | Synonyms: Norvir |
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| rottenstone | (noun) a weathered and decomposed siliceous limestone; in powdered form it is used in polishing | Synonyms: tripoli |
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| sabaton | (noun) armor plate that protects the foot; consists of mail with a solid toe and heel | Synonyms: solleret |
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| sandstone | (noun) a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.) | - |
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| semitone | (noun) the musical interval between adjacent keys on a keyboard instrument | Synonyms: half step |
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| serotonin | (noun) a neurotransmitter involved in e.g. sleep and depression and memory | Synonyms: 5-hydroxytryptamine |
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| sexton | (noun) an officer of the church who is in charge of sacred objects | Synonyms: sacristan |
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| siltstone | (noun) a fine-grained sandstone of consolidated silt | - |
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| simpleton | (noun) a person lacking intelligence or common sense | Synonyms: simple |
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| singleton | (noun) the playing card that is the only card in a suit held in a bridge hand as initially dealt | - |
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| (noun) a set containing a single member | - |
| (noun) a single object (as distinguished from a pair) | - |
| skeleton | (noun) the internal supporting structure that gives an artifact its shape | Synonyms: frame, skeletal frame, underframe |
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| (noun) the hard structure (bones and cartilages) that provides a frame for the body of an animal | Synonyms: frame, skeletal system, systema skeletale |
| (noun) a scandal that is kept secret | Synonyms: skeleton in the closet, skeleton in the cupboard |
| (noun) something reduced to its minimal form | - |
| soapstone | (noun) a soft heavy compact variety of talc having a soapy feel; used to make hearths and tabletops and ornaments | Synonyms: soap-rock, soaprock, steatite |
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| soliton | (noun) (physics) a quantum of energy or quasiparticle that can be propagated as a traveling wave in nonlinear systems and is neither preceded nor followed by another such disturbance; does not obey the superposition principle and does not dissipate | Synonyms: solitary wave, soliton wave |
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| spironolactone | (noun) a synthetic corticosteroid (trade name Aldactone) used to treat hypertension | Synonyms: Aldactone |
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| stone | (adjective) of any of various dull tannish or grey colors | - |
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| (noun) building material consisting of a piece of rock hewn in a definite shape for a special purpose | - |
| (noun) a lack of feeling or expression or movement | - |
| (noun) a lump or mass of hard consolidated mineral matter | Synonyms: rock |
| (noun) the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed | Synonyms: endocarp, pit |
| (noun) an avoirdupois unit used to measure the weight of a human body; equal to 14 pounds | - |
| (noun) material consisting of the aggregate of minerals like those making up the Earth's crust | Synonyms: rock |
| (noun) a crystalline rock that can be cut and polished for jewelry | Synonyms: gem, gemstone |
| (verb) remove the pits from | Synonyms: pit |
| (verb) kill by throwing stones at | Synonyms: lapidate |
| stonechat | (noun) common European chat with black plumage and a reddish-brown breast | Synonyms: Saxicola torquata |
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| stonecress | (noun) any Old World herb of the genus Aethionema; native of sunny limestone habitats | Synonyms: stone cress |
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| stonecrop | (noun) any of various northern temperate plants of the genus Sedum having fleshy leaves and red or yellow or white flowers | - |
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| stonecutter | (noun) someone who cuts or carves stone | Synonyms: cutter |
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| stoned | (adjective) under the influence of narcotics, especially cannabis | Synonyms: hopped-up |
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| stoneface | (noun) any plant of the genus Lithops native to Africa having solitary yellow or white flowers and thick leaves that resemble stones | Synonyms: flowering stone, lithops, living stone, stone-face, stone life face, stone plant |
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| stonefish | (noun) venomous tropical marine fish resembling a piece of rock | Synonyms: Synanceja verrucosa |
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| stonefly | (noun) primitive winged insect with a flattened body; used as bait by fishermen; aquatic gilled larvae are carnivorous and live beneath stones | Synonyms: plecopteran, stone fly |
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| stoneless | (adjective) (of fruits having stones) having the stone removed | - |
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| stonelike | (adjective) (of bone especially the temporal bone) resembling stone in hardness | Synonyms: petrous |
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| stonemason | (noun) a craftsman who works with stone or brick | Synonyms: mason |
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| stoner | (noun) an attacker who pelts the victim with stones (especially with intent to kill) | Synonyms: lapidator |
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| stoneroot | (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, horseweed, richweed, stone-root, stone root |
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| stonewall | (verb) engage in delaying tactics or refuse to cooperate | - |
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| (verb) obstruct or hinder any discussion | - |
| stonewaller | (noun) one who stonewalls or refuses to answer or cooperate; someone who delays by lengthy speeches etc. | - |
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| stonewalling | (noun) stalling or delaying especially by refusing to answer questions or cooperate | - |
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| stoneware | (noun) ceramic ware that is fired in high heat and vitrified and nonporous | - |
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| stonewash | (verb) wash with stones to achieve a worn appearance | Synonyms: stone-wash |
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| stonework | (noun) masonry done with stone | - |
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| stonewort | (noun) any of various submerged aquatic algae of the genus Chara having nodes with whorled filamentlike branches; usually encrusted with calcium carbonate deposits | - |
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| stonily | (adverb) in a stony manner | - |
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| stoning | (noun) the act of pelting with stones; punishment inflicted by throwing stones at the victim (even unto death) | Synonyms: lapidation |
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| stony | (adjective) hard as granite | Synonyms: granitelike, granitic, rocklike |
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| (adjective) showing unfeeling resistance to tender feelings | Synonyms: flint, flinty, granitic, obdurate |
| (adjective) abounding in rocks or stones | Synonyms: bouldered, bouldery, rocky |
| stonyhearted | (adjective) devoid of feeling for others | Synonyms: hardhearted, unfeeling |
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| subtonic | (noun) (music) the seventh note of the diatonic scale | Synonyms: leading tone |
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| sunstone | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: aventurine |
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| supertonic | (noun) (music) the second note of a diatonic scale | - |
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