| ctenophore | (noun) biradially symmetrical hermaphroditic solitary marine animals resembling jellyfishes having for locomotion eight rows of cilia arranged like teeth in a comb | Synonyms: comb jelly |
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| deforest | (verb) remove the trees from | Synonyms: disafforest, disforest |
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| deforestation | (noun) the removal of trees | Synonyms: disforestation |
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| (noun) the state of being clear of trees | - |
| dehydroretinol | (noun) a viscous alcohol that is less active in mammals than is vitamin A1 | Synonyms: vitamin A2 |
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| deplore | (verb) express strong condemnation of | - |
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| (verb) regret strongly | Synonyms: bemoan, bewail, lament |
| diaphoresis | (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: hidrosis, perspiration, sudation, sweating |
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| diaphoretic | (adjective) inducing perspiration | Synonyms: sudorific |
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| (noun) used to produce perspiration | - |
| disafforest | (verb) remove the trees from | Synonyms: deforest, disforest |
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| disforest | (verb) remove the trees from | Synonyms: deforest, disafforest |
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| disforestation | (noun) the removal of trees | Synonyms: deforestation |
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| dishonored | (adjective) suffering shame | Synonyms: discredited, disgraced, shamed |
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| drugstore | (noun) a retail shop where medicine and other articles are sold | Synonyms: apothecary's shop, chemist's, chemist's shop, pharmacy |
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| effloresce | (verb) come into or as if into flower | Synonyms: burst forth |
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| (verb) assume crystalline form; become crystallized | Synonyms: crystalise, crystalize, crystallize |
| (verb) become encrusted with crystals due to evaporation | - |
| efflorescence | (noun) a powdery deposit on a surface | Synonyms: bloom |
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| (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, florescence, flowering, inflorescence |
| (noun) any red eruption of the skin | Synonyms: rash, roseola, skin rash |
| (noun) the period of greatest prosperity or productivity | Synonyms: bloom, blossom, flower, flush, heyday, peak, prime |
| efflorescent | (adjective) when the bud, or buds, on a plant are bursting into flower | Synonyms: abloom |
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| electrophoresis | (noun) the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode | Synonyms: cataphoresis, dielectrolysis, ionophoresis |
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| electrophoretic | (adjective) of or relating to electrophoresis | Synonyms: cataphoretic |
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| electroretinogram | (noun) a graphical recording of the electrical activity of the retina that results when light is flashed into the eye | - |
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| enamored | (adjective) marked by foolish or unreasoning fondness | Synonyms: in love, infatuated, potty, smitten, soft on, taken with |
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| enamoredness | (noun) a feeling of love or fondness | Synonyms: amorousness |
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| encore | (noun) an extra or repeated performance; usually given in response to audience demand | - |
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| (verb) request an encore, from a performer | - |
| endospore | (noun) a small asexual spore that develops inside the cell of some bacteria and algae | - |
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| evermore | (adverb) for a limitless time | Synonyms: eternally, everlastingly, forever |
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| (adverb) at any future time; in the future | Synonyms: forevermore |
| explore | (verb) inquire into | Synonyms: research, search |
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| (verb) travel to or penetrate into | - |
| (verb) inquire into a subject in detail | - |
| (verb) examine (organs) for diagnostic purposes | - |
| explorer | (noun) someone who travels into little known regions (especially for some scientific purpose) | Synonyms: adventurer |
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| extempore | (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporaneous, extemporary, impromptu, off-the-cuff, offhand, offhanded, unrehearsed |
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| (adverb) without prior preparation | Synonyms: extemporaneously, extemporarily |
| eyesore | (noun) something very ugly and offensive | - |
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| favored | (adjective) preferred above all others and treated with partiality | Synonyms: best-loved, favorite, favoured, favourite, pet, preferent, preferred |
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| flavorer | (noun) something added to food primarily for the savor it imparts | Synonyms: flavoring, flavourer, flavouring, seasoner, seasoning |
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| floored | (adjective) provided with a floor | - |
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| florescence | (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, efflorescence, flowering, inflorescence |
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| floret | (noun) a diminutive flower (especially one that is part of a composite flower) | Synonyms: floweret |
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| fluoresce | (verb) exhibit or undergo fluorescence | - |
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| fluorescein | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluoresceine, fluorescent dye, resorcinolphthalein |
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| fluoresceine | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluorescent dye, resorcinolphthalein |
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| fluorescence | (noun) light emitted during absorption of radiation of some other (invisible) wavelength | - |
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| fluorescent | (adjective) brilliantly colored and apparently giving off light | - |
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| (adjective) emitting light during exposure to radiation from an external source | - |
| (noun) a lighting fixture that uses a fluorescent lamp | Synonyms: fluorescent fixture |
| folklore | (noun) the unwritten lore (stories and proverbs and riddles and songs) of a culture | - |
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| footsore | (adjective) having sore or tired feet | - |
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| fore | (adjective) situated at or toward the bow of a vessel | - |
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| (noun) front part of a vessel or aircraft | Synonyms: bow, prow, stem |
| (adverb) near or toward the bow of a ship or cockpit of a plane | Synonyms: forward |
| forearm | (noun) the part of the superior limb between the elbow and the wrist | - |
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| (verb) arm in advance of a confrontation | - |
| forebear | (noun) a person from whom you are descended | Synonyms: forbear |
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| forebode | (verb) make a prediction about; tell in advance | Synonyms: anticipate, call, foretell, predict, prognosticate, promise |
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| foreboding | (adjective) ominously prophetic | Synonyms: fateful, portentous |
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| (noun) an unfavorable omen | - |
| (noun) a feeling of evil to come | Synonyms: boding, premonition, presentiment |
| forebrain | (noun) the anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube | Synonyms: prosencephalon |
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| forecarriage | (noun) a small wheeled carriage attached under the front end of a plow beam. | Synonyms: fore carriage, wheeled forecarriage |
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| forecast | (noun) a prediction about how something (as the weather) will develop | Synonyms: prognosis |
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| (verb) judge to be probable | Synonyms: calculate, count on, estimate, figure, reckon |
| (verb) predict in advance | Synonyms: calculate |
| (verb) indicate, as with a sign or an omen | Synonyms: augur, auspicate, betoken, bode, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate |
| forecaster | (noun) someone who makes predictions of the future (usually on the basis of special knowledge) | Synonyms: predictor, prognosticator, soothsayer |
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| forecasting | (noun) a statement made about the future | Synonyms: foretelling, prediction, prognostication |
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| forecastle | (noun) living quarters consisting of a superstructure in the bow of a merchant ship where the crew is housed | Synonyms: fo'c'sle |
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| foreclose | (verb) subject to foreclosing procedures; take away the right of mortgagors to redeem their mortgage | - |
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| (verb) keep from happening or arising; make impossible | Synonyms: forbid, forestall, preclude, prevent |
| foreclosure | (noun) the legal proceedings initiated by a creditor to repossess the collateral for loan that is in default | - |
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| forecourt | (noun) the outer or front court of a building or of a group of buildings | - |
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| foredate | (verb) establish something as being earlier relative to something else | Synonyms: antedate, predate |
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| foredeck | (noun) the deck between the bridge and the forecastle | - |
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| foredge | (noun) the part of a book that faces inward when the book is shelved; the part opposite the spine | Synonyms: fore edge |
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| foredoom | (verb) doom beforehand | - |
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| forefather | (noun) the founder of a family | Synonyms: father, sire |
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| (noun) person from an earlier time who contributed to the tradition shared by some group | - |
| forefend | (verb) prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off | Synonyms: avert, avoid, debar, deflect, fend off, forfend, head off, obviate, stave off, ward off |
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| forefinger | (noun) the finger next to the thumb | Synonyms: index, index finger |
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| forefoot | (noun) a front foot of a quadruped | - |
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| forefront | (noun) the position of greatest importance or advancement; the leading position in any movement or field | Synonyms: cutting edge, vanguard |
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| (noun) the part in the front or nearest the viewer | Synonyms: head |
| foregather | (verb) collect in one place | Synonyms: assemble, forgather, gather, meet |
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| forego | (verb) lose (something) or lose the right to (something) by some error, offense, or crime | Synonyms: forfeit, forgo, give up, throw overboard, waive |
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| (verb) do without or cease to hold or adhere to | Synonyms: dispense with, foreswear, forgo, relinquish, waive |
| (verb) be earlier in time; go back further | Synonyms: antecede, antedate, forgo, precede, predate |
| foregoing | (adjective) especially of writing or speech; going before | - |
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| foregone | (adjective) well in the past; former | Synonyms: bygone, bypast, departed, gone |
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| foreground | (noun) (computer science) a window for an active application | - |
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| (noun) the part of a scene that is near the viewer | - |
| (verb) move into the foreground to make more visible or prominent | Synonyms: highlight, play up, spotlight |
| foregrounding | (noun) the execution of a program that preempts the use of the processing system | Synonyms: foreground processing |
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| forehand | (adjective) (of racket strokes) made with palm facing direction of stroke | Synonyms: forehanded |
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| (noun) (sports) a return made with the palm of the hand facing the direction of the stroke (as in tennis or badminton or squash) | Synonyms: forehand shot, forehand stroke |
| forehanded | (adjective) (of racket strokes) made with palm facing direction of stroke | Synonyms: forehand |
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| (adjective) having provided for the future | - |
| forehead | (noun) the part of the face above the eyes | Synonyms: brow |
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| (noun) the large cranial bone forming the front part of the cranium: includes the upper part of the orbits | Synonyms: frontal bone, os frontale |
| foreign | (adjective) relating to or originating in or characteristic of another place or part of the world | Synonyms: strange |
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| (adjective) of concern to or concerning the affairs of other nations (other than your own) | - |
| (adjective) not belonging to that in which it is contained; introduced from an outside source | Synonyms: extraneous |
| (adjective) not contained in or deriving from the essential nature of something | Synonyms: alien |
| foreigner | (noun) a person who comes from a foreign country; someone who does not owe allegiance to your country | Synonyms: alien, noncitizen, outlander |
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| (noun) someone who is excluded from or is not a member of a group | Synonyms: outsider |
| foreignness | (noun) the quality of being alien or not native | Synonyms: curiousness, strangeness |
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| foreknow | (verb) realize beforehand | Synonyms: anticipate, foresee, previse |
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| foreknowledge | (noun) knowledge of an event before it occurs | Synonyms: precognition |
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| forelady | (noun) a woman who is foreperson of a jury | Synonyms: forewoman |
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| foreland | (noun) a natural elevation (especially a rocky one that juts out into the sea) | Synonyms: head, headland, promontory |
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| (noun) land forming the forward margin of something | - |
| foreleg | (noun) the forelimb of a quadruped | - |
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| forelimb | (noun) the front limb (or the homologous structure in other animals, such as a flipper or wing) | - |
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| forelock | (noun) a lock of a horse's mane that grows forward between the ears | Synonyms: foretop |
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| (noun) a lock of hair growing (or falling) over the forehead | - |
| foreman | (noun) a person who exercises control over workers | Synonyms: boss, chief, gaffer, honcho |
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| (noun) a man who is foreperson of a jury | - |
| foremanship | (noun) the position of foreman | - |
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| foremast | (noun) the mast nearest the bow in vessels with two or more masts | - |
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| foremilk | (noun) milky fluid secreted for the first day or two after parturition | Synonyms: colostrum |
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| foremost | (adjective) ranking above all others | Synonyms: first, world-class |
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| (adjective) situated closest to the bow | - |
| (adjective) preceding all others in spatial position | Synonyms: frontmost |
| (adverb) prominently forward | Synonyms: first |
| (adverb) before anything else | Synonyms: first, first of all, first off, firstly |
| foremother | (noun) a female ancestor | - |
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| forename | (noun) the name that precedes the surname | Synonyms: first name, given name |
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| forenoon | (noun) the time period between dawn and noon | Synonyms: morn, morning, morning time |
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| forensic | (adjective) used or applied in the investigation and establishment of facts or evidence in a court of law | - |
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| (adjective) of, relating to, or used in public debate or argument | - |
| forensics | (noun) scientific tests or techniques used in the investigation of crimes | - |
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| foreordain | (verb) foreordain or determine beforehand | Synonyms: predestine, preordain |
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| (verb) foreordain by divine will or decree | Synonyms: predestinate, predestine |
| foreordained | (adjective) established or prearranged unalterably | Synonyms: predestinate, predestined |
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| foreordination | (noun) (theology) being determined in advance; especially the doctrine (usually associated with Calvin) that God has foreordained every event throughout eternity (including the final salvation of mankind) | Synonyms: predestination, predetermination, preordination |
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| forepart | (noun) the side that is forward or prominent | Synonyms: front, front end |
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| forepaw | (noun) front paw; analogous to the human hand | - |
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| foreperson | (noun) the presiding member of the jury and the one who speaks on their behalf | - |
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| foreplay | (noun) mutual sexual fondling prior to sexual intercourse | Synonyms: arousal, stimulation |
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| forequarter | (noun) the front half of a side of meat | - |
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| forerunner | (noun) something that precedes and indicates the approach of something or someone | Synonyms: harbinger, herald, precursor, predecessor |
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| (noun) a person who goes before or announces the coming of another | Synonyms: precursor |
| (noun) anything that precedes something similar in time | Synonyms: antecedent |