| mastocyte | (noun) a large connective tissue cell that contains histamine and heparin and serotonin which are released in allergic reactions or in response to injury or inflammation | Synonyms: labrocyte, mast cell |
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| mastodon | (noun) extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth | Synonyms: mastodont |
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| mastodont | (noun) extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth | Synonyms: mastodon |
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| mastoid | (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid bone, mastoid process, mastoidal |
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| mastoidal | (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid, mastoid bone, mastoid process |
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| mastoidale | (noun) the craniometric point at the lowest point of the mastoid process | - |
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| mastoidectomy | (noun) surgical removal of some or all of the mastoid process | - |
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| mastoiditis | (noun) inflammation of the mastoid | - |
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| mastopathy | (noun) any pathology of the breast | Synonyms: mazopathy |
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| mastopexy | (noun) plastic surgery to lift or reshape the breasts | - |
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| masturbation | (noun) manual stimulation of the genital organs (of yourself or another) for sexual pleasure | Synonyms: onanism |
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| masturbator | (noun) a person who practices masturbation | Synonyms: onanist |
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| mediastinum | (noun) the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus | - |
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| megaloblast | (noun) abnormally large red blood cell present in pernicious anemia and folic acid deficiency | - |
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| melanoblast | (noun) an epidermal cell that is a precursor of a melanocyte | - |
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| mesoblast | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoderm |
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| metastability | (noun) the quality of a physical system that persists in its existing equilibrium when undisturbed (or only slightly disturbed) but able to pass to a more stable equilibrium when sufficiently disturbed | - |
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| metastasis | (noun) the spreading of a disease (especially cancer) to another part of the body | - |
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| mizenmast | (noun) third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy | Synonyms: mizen, mizzen, mizzenmast |
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| mizzenmast | (noun) third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy | Synonyms: mizen, mizenmast, mizzen |
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| monastery | (noun) the residence of a religious community | - |
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| monastic | (noun) a male religious living in a cloister and devoting himself to contemplation and prayer and work | Synonyms: monk |
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| monasticism | (noun) asceticism as a form of religious life; usually conducted in a community under a common rule and characterized by celibacy and poverty and obedience | - |
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| monoblast | (noun) a large immature monocyte normally found in bone marrow | - |
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| myasthenia | (noun) a chronic progressive disease characterized by chronic fatigue and muscular weakness (especially in the face and neck); caused by a deficiency of acetylcholine at the neuromuscular junctions | Synonyms: myasthenia gravis |
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| (noun) any muscular weakness | - |
| myeloblast | (noun) a precursor of leukocytes that normally occurs only in bone marrow | - |
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| myringoplasty | (noun) surgical repair of a perforated eardrum with a tissue graft | - |
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| nastika | (noun) Technical term in Hinduism used to classify philosophical schools and persons that do not accept the authority of the Vedas as supreme revealed scriptures. | - |
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| nastiness | (noun) the quality of being highly unpleasant | - |
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| (noun) malevolence by virtue of being malicious or spiteful or nasty | Synonyms: bitchiness, cattiness, spite, spitefulness |
| (noun) a state characterized by foul or disgusting dirt and refuse | Synonyms: filth, filthiness, foulness |
| nasturtium | (noun) flowers and seeds and leaves all used as flavorings | - |
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| (noun) any tropical American plant of the genus Tropaeolum having pungent juice and long-spurred yellow to red flowers | - |
| nephroblastoma | (noun) malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass | Synonyms: adenomyosarcoma, embryoma of the kidney, Wilms' tumor, Wilms tumour |
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| neurasthenia | (noun) nervous breakdown (not in technical use) | - |
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| neurasthenic | (noun) a person suffering a nervous breakdown | - |
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| neuroblast | (noun) a cell from which a nerve cell develops | - |
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| neuroblastoma | (noun) malignant tumor containing embryonic nerve cells; usually metastasizes quickly | - |
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| neuroplasty | (noun) plastic surgery of the nerves | - |
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| newscast | (noun) a broadcast of news or commentary on the news | - |
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| newscaster | (noun) someone who broadcasts the news | - |
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| noreaster | (noun) a storm blowing from the northeast | Synonyms: northeaster |
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| northeast | (noun) a location in the northeastern part of a country, region, or city | - |
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| (noun) the compass point midway between north and east; at 45 degrees | Synonyms: NE, nor'-east, northeastward |
| (noun) the direction corresponding to the northeastward compass point | - |
| northeaster | (noun) a storm blowing from the northeast | Synonyms: noreaster |
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| northeastward | (noun) the compass point midway between north and east; at 45 degrees | Synonyms: NE, nor'-east, northeast |
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| oast | (noun) a kiln for drying hops | - |
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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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| ommastrephes | (noun) extremely active cylindrical squid with short strong arms and large rhombic terminal fins | - |
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| onomasticon | (noun) a list of proper nouns naming persons or places | - |
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| onomastics | (noun) the branch of lexicology that studies the forms and origins of proper names | - |
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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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| osteoclast | (noun) cell that functions in the breakdown and resorption of bone tissue | - |
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| otoplasty | (noun) reconstructive surgery of the auricle of the external ear | - |
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| outcast | (noun) a person who is rejected (from society or home) | Synonyms: castaway, Ishmael, pariah |
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| outcaste | (noun) a person belonging to no caste | - |
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| overcast | (noun) a cast that falls beyond the intended spot | - |
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| (noun) a long whipstitch or overhand stitch overlying an edge to prevent raveling | Synonyms: overcasting |
| (noun) the state of the sky when it is covered by clouds | Synonyms: cloud cover, cloudiness |
| (noun) gloomy semidarkness caused by cloud cover | Synonyms: cloudiness |
| overcasting | (noun) a long whipstitch or overhand stitch overlying an edge to prevent raveling | Synonyms: overcast |
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| paederast | (noun) a man who has sex (usually sodomy) with a boy as the passive partner | Synonyms: child molester, pederast |
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| paederasty | (noun) sexual relations between a man and a boy (usually anal intercourse with the boy as a passive partner) | Synonyms: pederasty |
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| palatopharyngoplasty | (noun) surgical resection of unnecessary palatal and oropharyngeal tissue to open the airway; intended to cure extreme cases of snoring (with or without sleep apnea) | Synonyms: PPP, UPPP, uvulopalatopharyngoplasty |
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| past | (noun) a verb tense that expresses actions or states in the past | Synonyms: past tense |
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| (noun) the time that has elapsed | Synonyms: past times, yesteryear |
| (noun) a earlier period in someone's life (especially one that they have reason to keep secret) | - |
| pasta | (noun) shaped and dried dough made from flour and water and sometimes egg | Synonyms: alimentary paste |
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| (noun) a dish that contains pasta as its main ingredient | - |
| 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 | - |
| pasteboard | (noun) stiff cardboard made by pasting together layers of paper | - |
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| pastel | (noun) any of various pale or light colors | - |
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| paster | (noun) an adhesive label | Synonyms: gummed label, sticker |
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| (noun) a workman who pastes | - |
| pastern | (noun) the part between the fetlock and the hoof | Synonyms: fetter bone |
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| pasteurellosis | (noun) an acute infectious disease characterized by pneumonia and blood infection | Synonyms: hemorrhagic septicemia |
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| pasteurisation | (noun) partial sterilization of foods at a temperature that destroys harmful microorganisms without major changes in the chemistry of the food | Synonyms: pasteurization |
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| pasteuriser | (noun) an apparatus for pasteurizing substances (especially milk). | Synonyms: pasteurizer |
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| pasteurization | (noun) partial sterilization of foods at a temperature that destroys harmful microorganisms without major changes in the chemistry of the food | Synonyms: pasteurisation |
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| pasteurizer | (noun) an apparatus for pasteurizing substances (especially milk). | Synonyms: pasteuriser |
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| pastiche | (noun) a work of art that imitates the style of some previous work | - |
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| (noun) a musical composition consisting of a series of songs or other musical pieces from various sources | Synonyms: medley, potpourri |
| pastil | (noun) a medicated lozenge used to soothe the throat | Synonyms: cough drop, pastille, troche |
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| pastille | (noun) a medicated lozenge used to soothe the throat | Synonyms: cough drop, pastil, troche |
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| pastime | (noun) a diversion that occupies one's time and thoughts (usually pleasantly) | Synonyms: interest, pursuit |
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| pastis | (noun) similar to absinthe but containing no wormwood | - |
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| pastness | (noun) the quality of being past | - |
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| pastor | (noun) a person authorized to conduct religious worship | Synonyms: curate, minister, minister of religion, parson, rector |
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| pastoral | (noun) a musical composition that evokes rural life | Synonyms: idyl, idyll, pastorale |
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| (noun) a literary work idealizing the rural life (especially the life of shepherds) | - |
| (noun) a letter from a pastor to the congregation | - |
| pastorale | (noun) a musical composition that evokes rural life | Synonyms: idyl, idyll, pastoral |
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| pastorate | (noun) the position of pastor | Synonyms: pastorship |
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| (noun) pastors collectively | - |
| pastorship | (noun) the position of pastor | Synonyms: pastorate |
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| pastrami | (noun) highly seasoned cut of smoked beef | - |
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| pastry | (noun) any of various baked foods made of dough or batter | - |
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| (noun) a dough of flour and water and shortening | Synonyms: pastry dough |
| pasturage | (noun) bulky food like grass or hay for browsing or grazing horses or cattle | Synonyms: eatage, forage, grass, pasture |
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| (noun) succulent herbaceous vegetation of pastureland | Synonyms: herbage |
| pasture | (noun) bulky food like grass or hay for browsing or grazing horses or cattle | Synonyms: eatage, forage, grass, pasturage |
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| (noun) a field covered with grass or herbage and suitable for grazing by livestock | Synonyms: grazing land, lea, ley, pasture land, pastureland |
| pastureland | (noun) a field covered with grass or herbage and suitable for grazing by livestock | Synonyms: grazing land, lea, ley, pasture, pasture land |
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| pasty | (noun) small meat pie or turnover | - |
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| (noun) (usually used in the plural) one of a pair of adhesive patches worn to cover the nipples of exotic dancers and striptease performers | - |
| paymaster | (noun) a person in charge of paying wages | - |
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| pederast | (noun) a man who has sex (usually sodomy) with a boy as the passive partner | Synonyms: child molester, paederast |
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| pederasty | (noun) sexual relations between a man and a boy (usually anal intercourse with the boy as a passive partner) | Synonyms: paederasty |
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| pentastomid | (noun) wormlike arthropod having two pairs of hooks at the sides of the mouth; parasitic in nasal sinuses of mammals | Synonyms: tongue worm |
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| phalloplasty | (noun) reconstructive surgery on the penis to repair congenital abnormality or injury | - |
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| phenoplast | (noun) a thermosetting resin | Synonyms: phenolic, phenolic resin |
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| piaster | (noun) a fractional monetary unit in Egypt and Lebanon and Sudan and Syria | Synonyms: piastre |
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| (noun) 100 kurus equal 1 lira in Turkey | Synonyms: kurus, piastre |
| piastre | (noun) a fractional monetary unit in Egypt and Lebanon and Sudan and Syria | Synonyms: piaster |
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| (noun) 100 kurus equal 1 lira in Turkey | Synonyms: kurus, piaster |
| pilaster | (noun) a rectangular column that usually projects about a third of its width from the wall to which it is attached | - |
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| plasmablast | (noun) the precursor of a plasma cell | - |
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| plaster | (noun) adhesive tape used in dressing wounds | Synonyms: adhesive plaster, sticking plaster |
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| (noun) a surface of hardened plaster (as on a wall or ceiling) | Synonyms: plasterwork |
| (noun) a medical dressing consisting of a soft heated mass of meal or clay that is spread on a cloth and applied to the skin to treat inflamed areas or improve circulation etc. | Synonyms: cataplasm, poultice |
| (noun) a mixture of lime or gypsum with sand and water; hardens into a smooth solid; used to cover walls and ceilings | - |
| (noun) any of several gypsum cements; a white powder (a form of calcium sulphate) that forms a paste when mixed with water and hardens into a solid; used in making molds and sculptures and casts for broken limbs | Synonyms: plaster of Paris |
| plasterboard | (noun) wallboard with a gypsum plaster core bonded to layers of paper or fiberboard; used instead of plaster or wallboard to make interior walls | Synonyms: gypsum board |
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| plasterer | (noun) a worker skilled in applying plaster | - |
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