| cytophotometer | (noun) a photometer that can be used to locate and identify chemical compounds in a cell by measuring the intensity of the light that passes through stained sections of the cytoplasm | - |
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| cytophotometry | (noun) the study of chemical compounds inside a cell by means of a cytophotometer | - |
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| cytoplasm | (noun) the protoplasm of a cell excluding the nucleus; is full of proteins that control cell metabolism | Synonyms: cytol |
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| cytoplast | (noun) the intact cytoplasmic content of a cell | - |
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| cytosine | (noun) a base found in DNA and RNA and derived from pyrimidine; pairs with guanine | Synonyms: C |
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| cytoskeleton | (noun) a microscopic network of actin filaments and microtubules in the cytoplasm of many living cells that gives the cell shape and coherence | - |
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| cytosmear | (noun) a thin tissue or blood sample spread on a glass slide and stained for cytologic examination and diagnosis under a microscope | Synonyms: cytologic smear, smear |
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| cytosol | (noun) the aqueous part of the cytoplasm within which various particles and organelles are suspended | - |
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| cytostome | (noun) mouth of a protozoan | - |
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| cytotoxicity | (noun) the degree to which something is toxic to living cells | - |
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| cytotoxin | (noun) any substance that has a toxic effect on cells | - |
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| dacryocyst | (noun) either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands | Synonyms: lacrimal sac, tear sac |
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| dacryocystitis | (noun) inflammation of the lacrimal sac causing obstruction of the tube draining tears into the nose | - |
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| decadency | (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadence, degeneracy, degeneration |
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| decency | (noun) the quality of conforming to standards of propriety and morality | - |
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| (noun) the quality of being polite and respectable | - |
| deficiency | (noun) lack of an adequate quantity or number | Synonyms: inadequacy, insufficiency |
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| (noun) the state of needing something that is absent or unavailable | Synonyms: lack, want |
| degeneracy | (noun) moral perversion; impairment of virtue and moral principles | Synonyms: corruption, depravation, depravity, putrefaction |
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| (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadence, decadency, degeneration |
| delegacy | (noun) the appointment of a delegate | - |
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| (noun) a group of representatives or delegates | Synonyms: commission, delegation, deputation, mission |
| (noun) the state of serving as an official and authorized delegate or agent | Synonyms: agency, representation |
| delicacy | (noun) the quality of being beautiful and delicate in appearance | Synonyms: daintiness, fineness |
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| (noun) subtly skillful handling of a situation | Synonyms: diplomacy, discreetness, finesse |
| (noun) lack of physical strength | Synonyms: fragility |
| (noun) slenderness | Synonyms: slightness |
| (noun) lightness in movement or manner | Synonyms: airiness |
| (noun) refined taste; tact | Synonyms: discretion |
| (noun) something considered choice to eat | Synonyms: dainty, goody, kickshaw, treat |
| delinquency | (noun) an antisocial misdeed in violation of the law by a minor | Synonyms: juvenile delinquency |
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| (noun) a tendency to be negligent and uncaring | Synonyms: dereliction, willful neglect |
| (noun) nonpayment of a debt when due | - |
| democracy | (noun) the political orientation of those who favor government by the people or by their elected representatives | - |
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| (noun) the doctrine that the numerical majority of an organized group can make decisions binding on the whole group | Synonyms: majority rule |
| (noun) a political system in which the supreme power lies in a body of citizens who can elect people to represent them | Synonyms: commonwealth, republic |
| deoxycytidine | (noun) a nucleoside component of DNA; composed of cytosine and deoxyribose | Synonyms: cytidine |
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| dependency | (noun) a geographical area politically controlled by a distant country | Synonyms: colony |
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| (noun) the state of relying on or being controlled by someone or something else | Synonyms: dependance, dependence |
| (noun) being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs) | Synonyms: addiction, dependance, dependence, habituation |
| despondency | (noun) feeling downcast and disheartened and hopeless | Synonyms: despondence, disconsolateness, heartsickness |
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| detergency | (noun) detergent quality; the quality of having cleansing power | Synonyms: detergence |
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| dichromacy | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromasy, dichromatism, dichromatopsia, dichromia |
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| dicynodont | (noun) a kind of therapsid | - |
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| dideoxycytosine | (noun) an antiviral drug used to combat HIV infection; a nucleoside analog reverse transcriptase inhibitor (NARTI) | Synonyms: ddC, DDC, zalcitabine |
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| diplomacy | (noun) subtly skillful handling of a situation | Synonyms: delicacy, discreetness, finesse |
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| (noun) wisdom in the management of public affairs | Synonyms: statecraft, statesmanship |
| (noun) negotiation between nations | Synonyms: diplomatic negotiations |
| discrepancy | (noun) a difference between conflicting facts or claims or opinions | Synonyms: disagreement, divergence, variance |
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| (noun) an event that departs from expectations | Synonyms: variance, variant |
| disfluency | (noun) lack of skillfulness in speaking or writing | - |
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| divergency | (noun) the act of moving away in different direction from a common point | Synonyms: divergence |
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| (noun) an infinite series that has no limit | Synonyms: divergence |
| dormancy | (noun) quiet and inactive restfulness | Synonyms: quiescence, quiescency, sleeping |
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| (noun) a state of quiet (but possibly temporary) inaction | Synonyms: quiescence, quiescency |
| doxycycline | (noun) an antibiotic derived from tetracycline that is effective against many infections | Synonyms: Vibramycin |
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| eccyesis | (noun) pregnancy resulting from gestation elsewhere than in the uterus | Synonyms: ectopic gestation, ectopic pregnancy, extrauterine gestation, extrauterine pregnancy, metacyesis |
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| effeminacy | (noun) the trait of being effeminate (derogatory of a man) | Synonyms: effeminateness, sissiness, softness, unmanliness, womanishness |
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| efficacy | (noun) capacity or power to produce a desired effect | Synonyms: efficaciousness |
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| efficiency | (noun) skillfulness in avoiding wasted time and effort | - |
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| (noun) the ratio of the output to the input of any system | - |
| emergency | (noun) a brake operated by hand; usually operates by mechanical linkage | Synonyms: emergency brake, hand brake, parking brake |
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| (noun) a sudden unforeseen crisis (usually involving danger) that requires immediate action | Synonyms: exigency, pinch |
| (noun) a state in which martial law applies | - |
| encyclical | (noun) a letter from the pope sent to all Roman Catholic bishops throughout the world | Synonyms: encyclical letter |
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| encyclopaedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, cyclopedia, encyclopedia |
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| encyclopaedism | (noun) profound scholarly knowledge | Synonyms: encyclopedism, eruditeness, erudition, learnedness, learning, scholarship |
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| encyclopaedist | (noun) a person who compiles information for encyclopedias | Synonyms: encyclopedist |
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| encyclopedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, cyclopedia, encyclopaedia |
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| encyclopedism | (noun) profound scholarly knowledge | Synonyms: encyclopaedism, eruditeness, erudition, learnedness, learning, scholarship |
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| encyclopedist | (noun) a person who compiles information for encyclopedias | Synonyms: encyclopaedist |
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| epicycle | (noun) a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid | - |
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| epicycloid | (noun) a line generated by a point on a circle rolling around another circle | - |
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| episcopacy | (noun) the collective body of bishops | Synonyms: episcopate |
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| errancy | (noun) fallibility as indicated by erring or a tendency to err | - |
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| (noun) (Christianity) holding views that disagree with accepted doctrine; especially disagreement with papal infallibility | - |
| erythrocyte | (noun) a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus | Synonyms: RBC, red blood cell |
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| erythrocytolysin | (noun) any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin | Synonyms: erythrolysin, haemolysin, hemolysin |
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| excellency | (noun) an outstanding feature; something in which something or someone excels | Synonyms: excellence |
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| exercycle | (noun) an exercise device resembling a stationary bike | Synonyms: exercise bike |
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| exigency | (noun) a sudden unforeseen crisis (usually involving danger) that requires immediate action | Synonyms: emergency, pinch |
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| (noun) a pressing or urgent situation | - |
| (noun) that which is required in a particular situation —usually used in plural. | - |
| expectancy | (noun) something expected (as on the basis of a norm) | Synonyms: anticipation |
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| (noun) an expectation | Synonyms: anticipation |
| expediency | (noun) the quality of being suited to the end in view | Synonyms: expedience |
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| extravagancy | (noun) the quality of exceeding the appropriate limits of decorum or probability or truth | Synonyms: extravagance |
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| fallacy | (noun) a misconception resulting from incorrect reasoning | Synonyms: false belief |
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| fancy | (noun) imagination or fantasy; held by Coleridge to be more casual and superficial than true imagination | - |
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| (noun) something many people believe that is false | Synonyms: fantasy, illusion, phantasy |
| (noun) a predisposition to like something | Synonyms: fondness, partiality |
| fancywork | (noun) decorative needlework | Synonyms: embroidery |
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| ferricyanide | (noun) salt of ferricyanic acid obtained by oxidation of a ferrocyanide | - |
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| ferrocyanide | (noun) salt of ferrocyanic acid usually obtained by a reaction of a cyanide with iron sulphate | - |
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| fervency | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervidness, fervor, fervour, fire |
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| flatulency | (noun) a state of excessive gas in the alimentary canal | Synonyms: flatulence, gas |
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| flippancy | (noun) inappropriate levity | Synonyms: light-mindedness |
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| fluency | (noun) the quality of being facile in speech and writing | Synonyms: articulateness, volubility |
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| (noun) skillfulness in speaking or writing | - |
| (noun) powerful and effective language | Synonyms: eloquence, smoothness |
| fragrancy | (noun) a pleasingly sweet olfactory property | Synonyms: bouquet, fragrance, redolence, sweetness |
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| frequency | (noun) the number of observations in a given statistical category | Synonyms: absolute frequency |
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| (noun) the ratio of the number of observations in a statistical category to the total number of observations | Synonyms: relative frequency |
| (noun) the number of occurrences within a given time period | Synonyms: frequence, oftenness |
| gametocyte | (noun) an immature animal or plant cell that develops into a gamete by meiosis | - |
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| gangliocyte | (noun) a nerve cell whose body is outside the central nervous system | Synonyms: ganglion cell |
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| generalcy | (noun) the office and authority of a general | Synonyms: generalship |
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| geomancy | (noun) divination by means of signs connected with the earth (as points taken at random or the arrangement of particles thrown down at random or from the configuration of a region and its relation to another) | - |
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| gerontocracy | (noun) a political system governed by old men | - |
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| gigacycle | (noun) 1,000,000,000 periods per second | Synonyms: Gc, GHz, gigacycle per second, gigahertz |
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| granulocyte | (noun) a leukocyte that has granules in its cytoplasm | - |
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| granulocytopenia | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulocytosis, agranulosis |
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| gynecocracy | (noun) a political system governed by a woman | Synonyms: gynarchy |
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| haematocytopenia | (noun) an abnormally low number of red blood cells in the blood | Synonyms: hematocytopenia |
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| haematocyturia | (noun) the presence of red blood cells in the urine | Synonyms: hematocyturia |
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| halcyon | (noun) a mythical bird said to breed at the time of the winter solstice in a nest floating on the sea and to have the power of calming the winds and waves | - |
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| hematocyst | (noun) a cyst containing blood | Synonyms: blood cyst, hemorrhagic cyst |
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| hematocytopenia | (noun) an abnormally low number of red blood cells in the blood | Synonyms: haematocytopenia |
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| hematocyturia | (noun) the presence of red blood cells in the urine | Synonyms: haematocyturia |
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| hemicycle | (noun) a plane figure with the shape of half a circle | Synonyms: semicircle |
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| hesitancy | (noun) a certain degree of unwillingness | Synonyms: disinclination, hesitation, indisposition, reluctance |
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| (noun) a feeling of diffidence and indecision about doing something | Synonyms: hesitance |
| heterocycle | (noun) a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon | Synonyms: heterocyclic ring |
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| (noun) a compound containing a heterocyclic ring | Synonyms: heterocyclic, heterocyclic compound |
| heterocyclic | (noun) a compound containing a heterocyclic ring | Synonyms: heterocycle, heterocyclic compound |
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| hierocracy | (noun) a ruling body composed of clergy | - |
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| histiocyte | (noun) a macrophage that is found in connective tissue | - |
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| histiocytosis | (noun) a blood disease characterized by an abnormal multiplication of macrophages | - |
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| homothecy | (noun) (mathematics) an isotropic scaling transformation of an affine space with a single fixed point. | Synonyms: homothety |
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| hydromancy | (noun) divination by water (as by patterns seen in the ebb and flow of the tides) | - |
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| hydroxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: oxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| hyoscyamine | (noun) a poisonous crystalline alkaloid (isometric with atropine but more potent); used to treat excess motility of the gastrointestinal tract | - |
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| hypocycloid | (noun) a line generated by a point on a circle that rolls around inside another circle | - |
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| idiocy | (noun) extreme mental retardation | Synonyms: amentia |
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| illegitimacy | (noun) unlawfulness by virtue of not being authorized by or in accordance with law | - |
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| (noun) the status of being born to parents who were not married | Synonyms: bar sinister, bastardy |
| illiteracy | (noun) an inability to read | Synonyms: analphabetism |
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| (noun) ignorance resulting from not reading | - |
| immaculacy | (noun) The characteristic of having no stain or blemish; of being spotless, undefiled, clear, pure. | - |
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