| abacus | (noun) a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves | - |
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| (noun) a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave | - |
| acuity | (noun) a quick and penetrating intelligence | Synonyms: acuteness, keenness, sharpness |
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| (noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) | Synonyms: sharp-sightedness, visual acuity |
| aculea | (noun) small spiny outgrowth on the wings of certain insects | - |
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| aculeus | (noun) a sharp-pointed process especially a sting of a hymenopterous insect | - |
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| (noun) a stiff sharp-pointed plant process | - |
| acumen | (noun) shrewdness shown by keen insight | Synonyms: insightfulness |
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| (noun) a tapering point | - |
| acupressure | (noun) treatment of symptoms by applying pressure with the fingers to specific pressure points on the body | Synonyms: G-Jo, shiatsu |
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| acupuncture | (noun) treatment of pain or disease by inserting the tips of needles at specific points on the skin | Synonyms: stylostixis |
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| acute | (noun) a mark placed above a vowel to indicate pronunciation | Synonyms: acute accent, ague |
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| acuteness | (noun) the quality of having a sharp edge or point | - |
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| (noun) a quick and penetrating intelligence | Synonyms: acuity, keenness, sharpness |
| (noun) a sensitivity that is keen and highly developed | - |
| aquaculture | (noun) rearing aquatic animals or cultivating aquatic plants for food | - |
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| barracuda | (noun) any voracious marine fish of the genus Sphyraena having an elongated cylindrical body and large mouth with projecting lower jaw and long strong teeth | - |
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| caracul | (noun) hardy coarse-haired sheep of central Asia; lambs are valued for their soft curly black fur | Synonyms: broadtail, karakul |
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| dracunculiasis | (noun) a painful and debilitating infestation contracted by drinking stagnant water contaminated with Guinea worm larvae that can mature inside a human's abdomen until the worm emerges through a painful blister in the person's skin | Synonyms: Guinea worm, Guinea worm disease |
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| ejaculate | (noun) the thick white fluid containing spermatozoa that is ejaculated by the male genital tract | Synonyms: come, cum, seed, semen, seminal fluid |
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| ejaculation | (noun) an abrupt emphatic exclamation expressing emotion | Synonyms: interjection |
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| (noun) the discharge of semen in males | - |
| ejaculator | (noun) a speaker who utters a sudden exclamation | - |
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| (noun) a man who ejaculates semen | - |
| evacuation | (noun) the act of removing the contents of something | Synonyms: emptying, voidance |
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| (noun) the act of evacuating; leaving a place in an orderly fashion; especially for protection | - |
| (noun) the bodily process of discharging waste matter | Synonyms: elimination, excreting, excretion, voiding |
| evacuee | (noun) a person who has been evacuated from a dangerous place | - |
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| facula | (noun) a large bright spot on the sun's photosphere occurring most frequently in the vicinity of sunspots | Synonyms: solar facula |
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| (noun) a bright spot on a planet | - |
| faculty | (noun) one of the inherent cognitive or perceptual powers of the mind | Synonyms: mental faculty, module |
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| (noun) the body of teachers and administrators at a school | Synonyms: staff |
| guaiacum | (noun) hard greenish-brown wood of the lignum vitae tree and other trees of the genus Guaiacum | Synonyms: guaiac, lignum vitae |
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| (noun) medicinal resin from the lignum vitae tree | - |
| hyperacusia | (noun) abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels | Synonyms: auditory hyperesthesia, hyperacusis |
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| hyperacusis | (noun) abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels | Synonyms: auditory hyperesthesia, hyperacusia |
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| immaculacy | (noun) The characteristic of having no stain or blemish; of being spotless, undefiled, clear, pure. | - |
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| immaculateness | (noun) the state of being spotlessly clean | Synonyms: spotlessness |
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| lacuna | (noun) a blank gap or missing part | Synonyms: blank |
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| lacunar | (noun) an ornamental sunken panel in a ceiling or dome | Synonyms: caisson, coffer |
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| macula | (noun) a small yellowish central area of the retina that is rich in cones and that mediates clear detailed vision | Synonyms: macula lutea, macular area, yellow spot |
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| (noun) a patch of skin that is discolored but not usually elevated; caused by various diseases | Synonyms: macule |
| (noun) a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field | Synonyms: sunspot |
| maculation | (noun) the act of spotting or staining something | Synonyms: spotting, staining |
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| (noun) a small contrasting part of something | Synonyms: dapple, fleck, patch, speckle, spot |
| macule | (noun) a patch of skin that is discolored but not usually elevated; caused by various diseases | Synonyms: macula |
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| macumba | (noun) a Brazilian religious cult of African origin; combines voodoo elements with singing and chanting and dancing | - |
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| (noun) popular dance music of Brazil; derived from the practices of the macumba religious cult | - |
| (noun) (Brazil) followers of a religious cult of African origin | - |
| macushla | (noun) (an Irish term of address expressing affection) darling | - |
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| spectacular | (noun) a lavishly produced performance | - |
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| teacup | (noun) a cup from which tea is drunk | - |
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| (noun) as much as a teacup will hold | Synonyms: teacupful |
| teacupful | (noun) as much as a teacup will hold | Synonyms: teacup |
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| vacuity | (noun) total lack of meaning or ideas | Synonyms: inanity, mindlessness, pointlessness, senselessness |
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| (noun) a region that is devoid of matter | Synonyms: vacuum |
| (noun) the absence of matter | Synonyms: vacuum |
| vacuolation | (noun) the state of having become filled with vacuoles | Synonyms: vacuolisation, vacuolization |
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| vacuole | (noun) a tiny cavity filled with fluid in the cytoplasm of a cell | - |
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| vacuolisation | (noun) the state of having become filled with vacuoles | Synonyms: vacuolation, vacuolization |
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| vacuolization | (noun) the state of having become filled with vacuoles | Synonyms: vacuolation, vacuolisation |
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| vacuousness | (noun) indicative of or marked by mental vacuity and an absence of ideas | - |
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| vacuum | (noun) an electrical home appliance that cleans by suction | Synonyms: vacuum cleaner |
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| (noun) a region that is devoid of matter | Synonyms: vacuity |
| (noun) an empty area or space | Synonyms: emptiness, vacancy, void |
| (noun) the absence of matter | Synonyms: vacuity |
| vernacular | (noun) the everyday speech of the people (as distinguished from literary language) | - |
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| (noun) a characteristic language of a particular group (as among thieves) | Synonyms: argot, cant, jargon, lingo, patois, slang |