| millimicron | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, nanometer, nanometre, nm |
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| myonecrosis | (noun) localized death of muscle cell fibers | - |
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| necrobiosis | (noun) (physiology) the normal degeneration and death of living cells (as in various epithelial cells) | Synonyms: cell death |
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| necrolatry | (noun) superstitious worship or veneration of the dead. | - |
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| necrology | (noun) a notice of someone's death; usually includes a short biography | Synonyms: obit, obituary |
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| (noun) a list of people who died recently | - |
| necrolysis | (noun) disintegration and dissolution of dead tissue | - |
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| necromancer | (noun) one who practices magic or sorcery | Synonyms: magician, sorcerer, thaumaturge, thaumaturgist, wizard |
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| (noun) one who practices divination by conjuring up the dead | - |
| necromancy | (noun) conjuring up the dead, especially for prophesying | - |
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| (noun) the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world | Synonyms: black art, black magic, sorcery |
| necromania | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necrophilia, necrophilism |
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| necromantic | (adjective) relating to or associated with necromancy | Synonyms: necromantical |
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| (adjective) given to or produced by or used in the art of conjuring up the dead | - |
| necromantical | (adjective) relating to or associated with necromancy | Synonyms: necromantic |
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| necrophagia | (noun) feeding on corpses or carrion | Synonyms: necrophagy |
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| necrophagy | (noun) feeding on corpses or carrion | Synonyms: necrophagia |
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| necrophilia | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necromania, necrophilism |
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| necrophilism | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necromania, necrophilia |
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| necropolis | (noun) a tract of land used for burials | Synonyms: burial ground, burial site, burying ground, cemetery, graveyard, memorial park |
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| necropsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: autopsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| necrose | (verb) undergo necrosis | Synonyms: gangrene, mortify, sphacelate |
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| necrosis | (noun) the localized death of living cells (as from infection or the interruption of blood supply) | Synonyms: gangrene, mortification, sphacelus |
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| necrotic | (adjective) relating to or affected by necrosis | - |
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| omicron | (noun) the 15th letter of the Greek alphabet | - |
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| outcrop | (noun) the part of a rock formation that appears above the surface of the surrounding land | Synonyms: outcropping, rock outcrop |
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| (verb) appear on the surface, come to the surface on the ground | - |
| outcropping | (noun) the part of a rock formation that appears above the surface of the surrounding land | Synonyms: outcrop, rock outcrop |
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| overcrop | (verb) to exhaust by excessive cultivation | Synonyms: overcultivate |
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| overcrossing | (noun) a bridge designed for pedestrians | Synonyms: footbridge, pedestrian bridge |
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| overcrowd | (verb) crowd together too much | - |
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| (verb) cause to crowd together too much | - |
| phalacrosis | (noun) the condition of having no hair on the top of the head | Synonyms: baldness |
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| photomicrograph | (noun) a photograph taken with the help of a microscope | - |
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| radiomicrometer | (noun) radiometer that is extremely sensitive | - |
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| sacrosanct | (adjective) must be kept sacred | Synonyms: inviolable, inviolate |
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| scarecrow | (noun) an effigy in the shape of a man to frighten birds away from seeds | Synonyms: bird-scarer, scarer, straw man, strawman |
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| scarecrowish | (adjective) resembling a scarecrow in being thin and ragged | - |
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| scrod | (noun) young Atlantic cod or haddock especially one split and boned for cooking | Synonyms: schrod |
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| (noun) flesh of young Atlantic cod weighing up to 2 pounds; also young haddock and pollock; often broiled | Synonyms: schrod |
| scrofula | (noun) a form of tuberculosis characterized by swellings of the lymphatic glands | Synonyms: king's evil, struma |
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| scrofulous | (adjective) afflicted with scrofula | - |
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| (adjective) morally contaminated | - |
| (adjective) having a diseased appearance resembling scrofula | - |
| scroll | (noun) a document that can be rolled up (as for storage) | Synonyms: roll |
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| (noun) a round shape formed by a series of concentric circles (as formed by leaves or flower petals) | Synonyms: coil, curl, curlicue, gyre, ringlet, roll, whorl |
| (verb) move through text or graphics in order to display parts that do not fit on the screen | - |
| scrooge | (noun) a selfish person who is unwilling to give or spend | Synonyms: churl, niggard, skinflint |
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| scrotal | (adjective) relating to or having or lying within a scrotum | - |
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| scrotum | (noun) the external pouch that contains the testes | - |
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| scrounge | (verb) collect or look around for (food) | Synonyms: forage |
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| (verb) obtain or seek to obtain by cadging or wheedling | Synonyms: cadge, schnorr, shnorr |
| scrounger | (noun) someone who mooches or cadges (tries to get something free) | Synonyms: cadger, mooch, moocher |
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| sharecropper | (noun) small farmers and tenants | Synonyms: cropper, sharecrop farmer |
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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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| sucrose | (noun) a complex carbohydrate found in many plants and used as a sweetening agent | Synonyms: saccharose |
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| testcross | (noun) a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring | Synonyms: test-cross |
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| ultramicroscope | (noun) light microscope that uses scattered light to show particles too small to see with ordinary microscopes | Synonyms: dark-field microscope |
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| ultramicroscopic | (adjective) too small to be seen without an ultramicroscope | - |
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| uncropped | (adjective) not used for growing crops | - |
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| uncross | (verb) change from a crossed to an uncrossed position | - |
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| uncrossed | (adjective) not crossed | - |
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| (adjective) (of a check) not crossed | - |
| uncrowded | (adjective) having or allowing sufficient room | - |
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| uncrowned | (adjective) not (especially not yet) provided with a crown | Synonyms: crownless |
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| (adjective) not having an (artificial) crown on a tooth; used especially of molars and bicuspids | - |
| velcro | (verb) fasten with Velcro | - |
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