| myeloblast | (noun) a precursor of leukocytes that normally occurs only in bone marrow | - |
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| myelocyte | (noun) an immature leukocyte normally found in bone marrow | - |
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| myelofibrosis | (noun) fibrosis of the bone marrow | - |
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| myelogram | (noun) X-ray film of the spinal cord and spinal nerve roots and subarachnoid space | - |
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| 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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| myeloma | (noun) a tumor of the bone marrow (usually malignant) composed of cells normally found in bone marrow | - |
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| myelomeningocele | (noun) a congenital defect of the central nervous system in which a sac containing part of the spinal cord and its meninges protrude through a gap in the vertebral column; frequently accompanied by hydrocephalus and mental retardation | - |
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| naysayer | (noun) someone with an aggressively negative attitude | - |
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| osteomyelitis | (noun) an inflammation of bone and bone marrow (usually caused by bacterial infection) | - |
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| overlayer | (noun) protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior | Synonyms: overlay, sheathing |
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| oxeye | (noun) an oval or round dormer window | - |
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| (noun) Eurasian perennial herbs having daisylike flowers with yellow rays and dark centers | - |
| (noun) any North American shrubby perennial herb of the genus Heliopsis having large yellow daisylike flowers | Synonyms: heliopsis |
| panchayet | (noun) a village council in India or southern Pakistan | Synonyms: panchayat, punchayet |
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| payee | (noun) a person to whom money is paid | - |
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| payer | (noun) a person who pays money for something | Synonyms: remunerator |
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| pinkeye | (noun) inflammation of the conjunctiva of the eye | Synonyms: conjunctivitis |
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| platelayer | (noun) a workman who lays and repairs railroad tracks | Synonyms: tracklayer |
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| player | (noun) a theatrical performer | Synonyms: actor, histrion, role player, thespian |
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| (noun) a person who participates in or is skilled at some game | Synonyms: participant |
| (noun) someone who plays a music as a profession | Synonyms: instrumentalist, musician |
| (noun) a person who pursues a number of different social and sexual partners simultaneously | - |
| (noun) someone who takes part in an activity | Synonyms: participant |
| plyer | (noun) someone who plies a trade | Synonyms: plier |
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| plyers | (noun) a gripping hand tool with two hinged arms and (usually) serrated jaws | Synonyms: pair of pliers, pliers |
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| poliomyelitis | (noun) an acute viral disease marked by inflammation of nerve cells of the brain stem and spinal cord | Synonyms: acute anterior poliomyelitis, infantile paralysis, polio |
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| polyelectrolyte | (noun) an electrolyte of high molecular weight | - |
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| polyester | (noun) any of a large class of synthetic fabrics | - |
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| (noun) any of numerous synthetic resins; they are light and strong and weather resistant | - |
| (noun) a complex ester used for making fibers or resins or plastics or as a plasticizer | - |
| polyethylene | (noun) a lightweight thermoplastic; used especially in packaging and insulation | Synonyms: polythene |
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| portrayer | (noun) a painter or drawer of portraits | Synonyms: limner, portrait painter, portraitist |
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| prayer | (noun) the act of communicating with a deity (especially as a petition or in adoration or contrition or thanksgiving) | Synonyms: supplication |
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| (noun) earnest or urgent request | Synonyms: appeal, entreaty |
| (noun) a fixed text used in praying | - |
| (noun) reverent petition to a deity | Synonyms: orison, petition |
| (noun) someone who prays to God | Synonyms: supplicant |
| prayerbook | (noun) a book containing prayers | Synonyms: prayer book |
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| pseudocyesis | (noun) physiological state in which a woman exhibits symptoms of pregnancy but is not pregnant | Synonyms: false pregnancy |
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| punchayet | (noun) a village council in India or southern Pakistan | Synonyms: panchayat, panchayet |
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| pyelitis | (noun) inflammation of the renal pelvis | - |
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| pyelogram | (noun) an X ray of the kidneys and ureters | - |
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| pyelography | (noun) roentgenography of the kidney and ureters (usually after injection with a radiopaque dye) | - |
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| pyelonephritis | (noun) inflammation of the kidney and its pelvis caused by bacterial infection | - |
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| pyemia | (noun) septicemia caused by pus-forming bacteria being released from an abscess | Synonyms: pyaemia |
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| rabbiteye | (noun) shrub of southeastern United States grown commercially especially for canning industry | Synonyms: rabbit-eye blueberry, rabbiteye blueberry, Vaccinium ashei |
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| ratepayer | (noun) a person who pays local rates (especially a householder) | - |
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| redeye | (noun) a night flight from which the passengers emerge with eyes red from lack of sleep | Synonyms: redeye flight |
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| rye | (noun) whiskey distilled from rye or rye and malt | Synonyms: rye whiskey, rye whisky |
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| (noun) hardy annual cereal grass widely cultivated in northern Europe where its grain is the chief ingredient of black bread and in North America for forage and soil improvement | Synonyms: Secale cereale |
| (noun) the seed of the cereal grass | - |
| ryegrass | (noun) any of several annual or perennial Eurasian grasses | Synonyms: rye grass |
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| sawyer | (noun) any of several beetles whose larvae bore holes in dead or dying trees especially conifers | Synonyms: sawyer beetle |
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| (noun) one who is employed to saw wood | - |
| sayeret | (noun) Israel's elite secret commando unit responsible for counterterrorist and top secret intelligence gathering and hostage rescue missions | Synonyms: Sayeret Mat'kal, Sayeret Matkal |
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| shuteye | (noun) informal term for sleep | Synonyms: shut-eye |
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| slayer | (noun) someone who causes the death of a person or animal | Synonyms: killer |
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| sockeye | (noun) small salmon with red flesh; found in rivers and tributaries of the northern Pacific and valued as food; adults die after spawning | Synonyms: blueback salmon, Oncorhynchus nerka, red salmon, sockeye salmon |
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| (noun) fatty red flesh of salmon of Pacific coast and rivers | Synonyms: red salmon, sockeye salmon |
| soothsayer | (noun) someone who makes predictions of the future (usually on the basis of special knowledge) | Synonyms: forecaster, predictor, prognosticator |
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| sprayer | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomiser, atomizer, nebuliser, nebulizer, spray |
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| (noun) a worker who applies spray to a surface | - |
| stayer | (noun) a person or other animal having powers of endurance or perseverance | - |
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| strayer | (noun) someone who strays or falls behind | Synonyms: straggler |
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| stye | (noun) an infection of the sebaceous gland of the eyelid | Synonyms: eye infection, hordeolum, sty |
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| swayer | (noun) a person who rules or commands | Synonyms: ruler |
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| taxpayer | (noun) someone who pays taxes | - |
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| tracklayer | (noun) a workman who lays and repairs railroad tracks | Synonyms: platelayer |
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| unemployed | (noun) people who are involuntarily out of work (considered as a group) | Synonyms: unemployed people |
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| voyeur | (noun) a viewer who enjoys seeing the sex acts or sex organs of others | Synonyms: peeper, Peeping Tom |
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| voyeurism | (noun) a perversion in which a person receives sexual gratification from seeing the genitalia of others or witnessing others' sexual behavior | - |
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| voyeuse | (noun) a chair of the 18th century used at game tables, having a padded top rail on which spectators could lean. | - |
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| walleye | (noun) pike-like freshwater perches | Synonyms: dory, jack salmon, Stizostedion vitreum, walleyed pike |
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| (noun) strabismus in which one or both eyes are directed outward | Synonyms: divergent strabismus, exotropia |
| winceyette | (noun) cotton flannelette with a nap on both sides | - |
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| wye | (noun) the 25th letter of the Roman alphabet | Synonyms: Y, y |
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| yea | (noun) yes | - |
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| year | (noun) a body of students who graduate together | Synonyms: class |
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| (noun) the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun | - |
| (noun) a period of time containing 365 (or 366) days | Synonyms: twelvemonth, yr |
| (noun) a period of time occupying a regular part of a calendar year that is used for some particular activity | - |
| yearbook | (noun) a reference book that is published regularly once every year | Synonyms: annual, yearly |
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| (noun) a book published annually by the graduating class of a high school or college usually containing photographs of faculty and graduating students | - |
| yearling | (noun) an animal in its second year | - |
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| (noun) a racehorse considered one year old until the second Jan. 1 following its birth | - |
| (noun) a young child who is just beginning to walk | Synonyms: bambino, toddler, tot |
| yearly | (noun) a reference book that is published regularly once every year | Synonyms: annual, yearbook |
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| yearner | (noun) a person with a strong desire for something | Synonyms: longer, thirster |
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| yearning | (noun) prolonged unfulfilled desire or need | Synonyms: hungriness, longing |
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| years | (noun) a late time of life | Synonyms: age, eld, geezerhood, old age |
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| (noun) a prolonged period of time | Synonyms: age, long time |
| (noun) the time during which someone's life continues | Synonyms: days |
| yeast | (noun) any of various single-celled fungi that reproduce asexually by budding or division | - |
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| (noun) a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey | Synonyms: barm |
| yell | (noun) a loud utterance; often in protest or opposition | Synonyms: call, cry, outcry, shout, vociferation |
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| (noun) a loud utterance of emotion (especially when inarticulate) | Synonyms: cry |
| yeller | (noun) someone who communicates vocally in a very loud voice | Synonyms: bawler, bellower, roarer, screamer, screecher, shouter |
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| yelling | (noun) uttering a loud inarticulate cry as of pain or excitement | Synonyms: shouting |
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| yellow | (noun) yellow color or pigment; the chromatic color resembling the hue of sunflowers or ripe lemons | Synonyms: yellowness |
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| yellowbird | (noun) American finch whose male has yellow body plumage in summer | Synonyms: goldfinch, New World goldfinch, Spinus tristis |
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| (noun) yellow-throated American wood warbler | Synonyms: Dendroica petechia, golden warbler, yellow warbler |
| yellowcake | (noun) an impure mixture of uranium oxides obtained during the processing of uranium ore | Synonyms: U308 |
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| yellowfin | (noun) may reach 400 pounds; worldwide in tropics | Synonyms: Thunnus albacares, yellowfin tuna |
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| yellowhammer | (noun) European bunting the male being bright yellow | Synonyms: Emberiza citrinella, yellow bunting |
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| (noun) large flicker of eastern North America with a red neck and yellow undersurface to wings and tail | Synonyms: Colaptes auratus, yellow-shafted flicker |
| yellowlegs | (noun) either of two North American shorebird with yellow legs | - |
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| yellowness | (noun) yellow color or pigment; the chromatic color resembling the hue of sunflowers or ripe lemons | Synonyms: yellow |
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| yellowtail | (noun) superior food fish of the tropical Atlantic and Caribbean with broad yellow stripe along the sides and on the tail | Synonyms: Ocyurus chrysurus, yellowtail snapper |
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| (noun) game fish of southern California and Mexico having a yellow tail fin | Synonyms: Seriola dorsalis |
| yellowthroat | (noun) small olive-colored American warblers with yellow breast and throat | - |
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| yellowwood | (noun) any of various trees having yellowish wood or yielding a yellow extract | Synonyms: yellowwood tree |
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| (noun) the yellow wood of any of various yellowwood trees | - |
| yelp | (noun) a sharp high-pitched cry (especially by a dog) | Synonyms: yelping, yip |
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| yelping | (noun) a sharp high-pitched cry (especially by a dog) | Synonyms: yelp, yip |
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| yen | (noun) a yearning for something or to do something | Synonyms: hankering |
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| (noun) the basic unit of money in Japan; equal to 100 sen | - |
| yenta | (noun) (Yiddish) a woman who talks too much; a gossip unable to keep a secret; a woman who spreads rumors and scandal | - |
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| (noun) (Yiddish) a vulgar shrew; a shallow coarse termagant | - |
| yeoman | (noun) in former times was free and cultivated his own land | - |
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| (noun) officer in the (ceremonial) bodyguard of the British monarch | Synonyms: beefeater, yeoman of the guard |
| yeomanry | (noun) class of small freeholders who cultivated their own land | - |
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| (noun) a British volunteer cavalry force organized in 1761 for home defense later incorporated into the Territorial Army | - |
| yer | (noun) Either of two letters in Cyrillic alphabets, which originally represented phonemically the ultra-short vowels in Slavic languages. | - |
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| yes | (noun) an affirmative | - |
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| yeshiva | (noun) an academy for the advanced study of Jewish texts (primarily the Talmud) | Synonyms: yeshivah |
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| yeshivah | (noun) an academy for the advanced study of Jewish texts (primarily the Talmud) | Synonyms: yeshiva |
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| yesterday | (noun) the recent past | - |
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| (noun) the day immediately before today | - |
| yesteryear | (noun) the time that has elapsed | Synonyms: past, past times |
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| yeti | (noun) a large hairy humanoid creature said to live in the Himalayas | Synonyms: abominable snowman |
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| yew | (noun) any of numerous evergreen trees or shrubs having red cup-shaped berries and flattened needlelike leaves | - |
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| (noun) wood of a yew; especially the durable fine-grained light brown or red wood of the English yew valued for cabinetwork and archery bows | - |