| disaccharidase | (noun) an enzyme that catalyzes the hydrolysis of disaccharides into monosaccharides | - |
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| disaccharide | (noun) any of a variety of carbohydrates that yield two monosaccharide molecules on complete hydrolysis | - |
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| dissidence | (noun) disagreement; especially disagreement with the government | - |
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| dissident | (noun) a person who dissents from some established policy | Synonyms: contestant, dissenter, objector, protester |
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| divide | (noun) a ridge of land that separates two adjacent river systems | Synonyms: water parting, watershed |
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| (noun) a serious disagreement between two groups of people (typically producing tension or hostility) | - |
| dividend | (noun) that part of the earnings of a corporation that is distributed to its shareholders; usually paid quarterly | - |
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| (noun) a bonus; something extra (especially a share of a surplus) | - |
| (noun) a number to be divided by another number | - |
| divider | (noun) a vertical structure that divides or separates (as a wall divides one room from another) | Synonyms: partition |
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| (noun) a drafting instrument resembling a compass that is used for dividing lines into equal segments or for transferring measurements | - |
| (noun) a person who separates something into parts or groups | - |
| (noun) a taxonomist who classifies organisms into many groups on the basis of relatively minor characteristics | Synonyms: splitter |
| dockside | (noun) the region adjacent to a boat dock | - |
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| downside | (noun) a negative aspect of something that is generally positive | - |
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| drawbridge | (noun) a bridge that can be raised to block passage or to allow boats or ships to pass beneath it | Synonyms: lift bridge |
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| druidism | (noun) the system of religion and philosophy taught by the Druids and their rites and ceremonies | - |
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| ebbtide | (noun) the tide while water is flowing out | - |
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| ecdysteroid | (noun) #DD: The name 'ecdysteroid' refers to the insect moulting and sex hormones which include ecdysone and its homologues such as 20-hydroxyecdysone. | - |
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| echidna | (noun) a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to Australia | Synonyms: anteater, spiny anteater |
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| (noun) a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to New Guinea | Synonyms: anteater, spiny anteater |
| eider | (noun) duck of the Northern Hemisphere much valued for the fine soft down of the females | Synonyms: eider duck |
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| eiderdown | (noun) down of the eider duck | - |
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| (noun) a soft quilt usually filled with the down of the eider | Synonyms: continental quilt, duvet |
| eidos | (noun) (anthropology) the distinctive expression of the cognitive or intellectual character of a culture or a social group | - |
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| elapid | (noun) any of numerous venomous fanged snakes of warmer parts of both hemispheres | Synonyms: elapid snake |
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| elaterid | (noun) any of various widely distributed beetles | Synonyms: elater, elaterid beetle |
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| ellipsoid | (noun) a surface whose plane sections are all ellipses or circles | - |
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| elucidation | (noun) an interpretation that removes obstacles to understanding | Synonyms: clarification, illumination |
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| (noun) an act of explaining that serves to clear up and cast light on | - |
| embroiderer | (noun) someone who ornaments with needlework | - |
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| embroideress | (noun) a woman embroiderer | - |
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| embroidery | (noun) decorative needlework | Synonyms: fancywork |
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| (noun) elaboration of an interpretation by the use of decorative (sometimes fictitious) detail | Synonyms: embellishment |
| encainide | (noun) antiarrhythmic drug (trade name Enkaid) used to treat life-threatening arrhythmias but increases the risk of sudden death in heart attack patients | Synonyms: Enkaid |
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| enchiridion | (noun) a concise reference book providing specific information about a subject or location | Synonyms: handbook, vade mecum |
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| energid | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: protoplast |
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| ephemerid | (noun) short-lived insect | Synonyms: ephemeropteran |
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| epicycloid | (noun) a line generated by a point on a circle rolling around another circle | - |
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| epidemic | (noun) a widespread outbreak of an infectious disease; many people are infected at the same time | - |
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| epidemiologist | (noun) a medical scientist who studies the transmission and control of epidemic diseases | - |
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| epidemiology | (noun) the branch of medical science dealing with the transmission and control of disease | - |
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| epidendron | (noun) any of various orchids of the genus Epidendrum | - |
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| epidermis | (noun) the outer layer of the skin covering the exterior body surface of vertebrates | Synonyms: cuticle |
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| epidiascope | (noun) an optical projector that gives images of both transparent and opaque objects | - |
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| epididymis | (noun) a convoluted tubule in each testis; carries sperm to vas deferens | - |
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| epididymitis | (noun) painful inflammation of the epididymis | - |
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| epidural | (noun) regional anesthesia resulting from injection of an anesthetic into the epidural space of the spinal cord; sensation is lost in the abdominal and genital and pelvic areas; used in childbirth and gynecological surgery | Synonyms: epidural anaesthesia, epidural anesthesia |
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| equid | (noun) hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck | Synonyms: equine |
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| equidistribution | (noun) a flat distribution having equal frequencies of occurrence | - |
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| ethanamide | (noun) a colorless solid amide of acetic acid used as a solvent and in the synthesis of organic compounds | Synonyms: acetamide |
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| ethmoid | (noun) one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity | Synonyms: ethmoid bone |
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| ethosuximide | (noun) an anticonvulsant drug (trade names Emeside and Zarontin) used to treat petit mal epilepsy | Synonyms: Emeside, Zarontin |
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| euglenid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenoid, euglenophyte |
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| euglenoid | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenid, euglenophyte |
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| eunuchoidism | (noun) the state of being a eunuch (either because of lacking testicles or because they failed to develop) | Synonyms: male hypogonadism |
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| eurypterid | (noun) large extinct scorpion-like arthropod considered related to horseshoe crabs | - |
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| eventide | (noun) the latter part of the day (the period of decreasing daylight from late afternoon until nightfall) | Synonyms: eve, even, evening |
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| evidence | (noun) your basis for belief or disbelief; knowledge on which to base belief | Synonyms: grounds |
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| (noun) (law) all the means by which any alleged matter of fact whose truth is investigated at judicial trial is established or disproved | - |
| (noun) an indication that makes something evident | - |
| exaltolide | (noun) the macrocyclic lactone having fifteen carbon atoms; it has a musky scent, similar to exaltone. | - |
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| eyelid | (noun) either of two folds of skin that can be moved to cover or open the eye | Synonyms: lid, palpebra |
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| factoid | (noun) a brief (usually one sentence and usually trivial) news item | - |
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| (noun) something resembling a fact; unverified (often invented) information that is given credibility because it appeared in print | - |
| famotidine | (noun) a histamine blocker (trade name Pepcid) used to treat peptic ulcers and gastritis and esophageal reflux | Synonyms: Pepcid |
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| fastidiousness | (noun) the trait of being meticulous about matters of taste or style | - |
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| felid | (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: feline |
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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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| fervidness | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervor, fervour, fire |
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| feticide | (noun) the act of destroying a fetus | Synonyms: aborticide |
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| fetidness | (noun) the attribute of having a strong offensive smell | Synonyms: foulness, malodorousness, rankness, stinkiness |
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| fibrinopeptide | (noun) peptide released from the amino end of fibrinogen by the action of thrombin to form fibrin during clotting of the blood | - |
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| fibroid | (noun) benign tumor containing fibrous tissue (especially in the uterus) | Synonyms: fibroid tumor |
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| fiddle | (noun) bowed stringed instrument that is the highest member of the violin family; this instrument has four strings and a hollow body and an unfretted fingerboard and is played with a bow | Synonyms: violin |
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| fiddlehead | (noun) New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds; the early uncurling fronds are edible | Synonyms: cinnamon fern, fiddlehead fern, Osmunda cinnamonea |
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| (noun) tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes | Synonyms: Matteuccia struthiopteris, Onoclea struthiopteris, ostrich fern, Pteretis struthiopteris, shuttlecock fern |
| fiddleneck | (noun) hairy annual of California to Mexico with crowded cymes of small blue to lilac or mauve flowers | Synonyms: Phacelia tanacetifolia |
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| fiddler | (noun) a musician who plays the violin | Synonyms: violinist |
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| (noun) an unskilled person who tries to fix or mend | Synonyms: tinkerer |
| (noun) someone who manipulates in a nervous or unconscious manner | Synonyms: twiddler |
| fiddlestick | (noun) a bow used in playing the violin | Synonyms: violin bow |
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| fidelity | (noun) the quality of being faithful | Synonyms: faithfulness |
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| (noun) accuracy with which an electronic system reproduces the sound or image of its input signal | - |
| fidget | (noun) a feeling of agitation expressed in continual motion | Synonyms: fidgetiness, restlessness |
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| fidgetiness | (noun) a feeling of agitation expressed in continual motion | Synonyms: fidget, restlessness |
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| fiduciary | (noun) a person who holds assets in trust for a beneficiary | - |
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| filicide | (noun) the murder of your own son or daughter | - |
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| (noun) a parent who murders his own son or daughter | - |
| fireside | (noun) home symbolized as a part of the fireplace | Synonyms: hearth |
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| (noun) an area near a fireplace (usually paved and extending out into a room) | Synonyms: hearth |
| flaccidity | (noun) a flabby softness | Synonyms: flabbiness, limpness |
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| flavonoid | (noun) any of a large class of plant pigments having a chemical structure based on or similar to flavone | - |
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| flecainide | (noun) oral antiarrhythmic medication (trade name Tambocor) used as a last resort in treating arrhythmias; increases the risk of sudden death in heart attack patients | Synonyms: Tambocor |
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| floridity | (noun) extravagant elaborateness | Synonyms: flamboyance, floridness, showiness |
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| floridness | (noun) extravagant elaborateness | Synonyms: flamboyance, floridity, showiness |
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| floxuridine | (noun) antineoplastic drug used to treat some cancers; can cause loss of hair | - |
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| fluid | (noun) continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas | - |
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| (noun) a substance that is fluid at room temperature and pressure | - |
| fluidity | (noun) the property of flowing easily | Synonyms: fluidness, liquidity, liquidness, runniness |
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| (noun) a changeable quality | Synonyms: fluidness |
| fluidness | (noun) the property of flowing easily | Synonyms: fluidity, liquidity, liquidness, runniness |
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| (noun) a changeable quality | Synonyms: fluidity |
| fluidounce | (noun) a United States unit of capacity or volume equal to 1.804 cubic inches | Synonyms: fluid ounce |
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| (noun) a British imperial unit of capacity or volume (liquid or dry) equal to 8 fluid drams or 28.416 cubic centimeters (1.734 cubic inches) | Synonyms: fluid ounce |
| fluidram | (noun) a unit of capacity or volume in the apothecary system equal to one eighth of a fluid ounce | Synonyms: drachm, fluid drachm, fluid dram |
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| (noun) a British imperial capacity measure (liquid or dry) equal to 60 minims or 3.5516 cubic centimeters | Synonyms: drachm, fluid drachm, fluid dram |
| fluoridation | (noun) the addition of a fluoride to the water supply (to prevent dental decay) | Synonyms: fluoridisation, fluoridization |
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| fluoride | (noun) a salt of hydrofluoric acid | - |
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| fluoridisation | (noun) the addition of a fluoride to the water supply (to prevent dental decay) | Synonyms: fluoridation, fluoridization |
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| fluoridization | (noun) the addition of a fluoride to the water supply (to prevent dental decay) | Synonyms: fluoridation, fluoridisation |
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| fluoroboride | (noun) a salt of fluoroboric acid | - |
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| flybridge | (noun) the highest navigational bridge on a ship; a small (often open) deck above the pilot house | Synonyms: fly bridge, flying bridge, monkey bridge |
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| footbridge | (noun) a bridge designed for pedestrians | Synonyms: overcrossing, pedestrian bridge |
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| forbiddance | (noun) the action of prohibiting or inhibiting or forbidding (or an instance thereof) | Synonyms: inhibition, prohibition |
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| (noun) an official prohibition or edict against something | Synonyms: ban, banning, forbidding |
| forbidding | (noun) an official prohibition or edict against something | Synonyms: ban, banning, forbiddance |
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| formidability | (noun) impressive difficulty | Synonyms: toughness |
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| fratricide | (noun) the murder of your sibling | - |
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| (noun) fire that injures or kills an ally | Synonyms: friendly fire |
| (noun) a person who murders their brother or sister | - |
| fridge | (noun) a refrigerator in which the coolant is pumped around by an electric motor | Synonyms: electric refrigerator |
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| frigidity | (noun) a lack of affection or enthusiasm | Synonyms: chilliness, coldness, coolness, frigidness, iciness |
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| (noun) sexual unresponsiveness (especially of women) and inability to achieve orgasm during intercourse | Synonyms: frigidness |
| (noun) the absence of heat | Synonyms: cold, coldness, frigidness, low temperature |
| frigidness | (noun) a lack of affection or enthusiasm | Synonyms: chilliness, coldness, coolness, frigidity, iciness |
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| (noun) sexual unresponsiveness (especially of women) and inability to achieve orgasm during intercourse | Synonyms: frigidity |
| (noun) the absence of heat | Synonyms: cold, coldness, frigidity, low temperature |
| fucoid | (noun) any of various algae of the family Fucaceae | Synonyms: fucoid algae |
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| (noun) a fossilized cast or impression of algae of the order Fucales | - |
| fungicide | (noun) any agent that destroys or prevents the growth of fungi | Synonyms: antifungal, antifungal agent, antimycotic, antimycotic agent |
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