| era | (noun) a period marked by distinctive character or reckoned from a fixed point or event | Synonyms: epoch |
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| (noun) a major division of geological time; an era is usually divided into two or more periods | Synonyms: geological era |
| eradication | (noun) the complete destruction of every trace of something | Synonyms: obliteration |
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| eradicator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: exterminator, terminator |
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| eraser | (noun) an implement used to erase something | - |
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| erasure | (noun) deletion by an act of expunging or erasing | Synonyms: expunction, expunging |
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| (noun) a correction made by erasing | - |
| (noun) a surface area where something has been erased | - |
| erbium | (noun) a trivalent metallic element of the rare earth group; occurs with yttrium | Synonyms: atomic number 68, Er |
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| erecting | (noun) the act of building or putting up | Synonyms: erection |
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| erection | (noun) the act of building or putting up | Synonyms: erecting |
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| (noun) a structure that has been erected | - |
| (noun) an erect penis | Synonyms: hard-on |
| erectness | (noun) the property of being upright in posture | Synonyms: uprightness |
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| (noun) position at right angles to the horizon | Synonyms: uprightness, verticality, verticalness |
| eremite | (noun) a Christian recluse | - |
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| eremitism | (noun) monasticism characterized by solitude in which the social dimension of life is sacrificed to the primacy of religious experience | - |
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| erethism | (noun) an abnormally high degree of irritability or sensitivity to stimulation of an organ or body part | - |
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| erg | (noun) a cgs unit of work or energy; the work done by a force of one dyne acting over a distance of one centimeter | - |
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| ergocalciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: calciferol, cholecalciferol, D, viosterol, vitamin D |
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| ergodicity | (noun) an attribute of stochastic systems; generally, a system that tends in probability to a limiting form that is independent of the initial conditions | - |
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| ergometer | (noun) measuring instrument designed to measure power | Synonyms: dynamometer |
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| ergonomics | (noun) the branch of engineering science in which biological science is used to study the relation between workers and their environments | Synonyms: bioengineering, biotechnology |
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| ergonovine | (noun) an alkaloid derived from ergot (trade name Ergotrate Maleate) that is less toxic than ergot; induces muscular contraction of the uterus and is administered after childbirth or abortion | Synonyms: Ergotrate Maleate |
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| ergosterol | (noun) a plant sterol that is converted into vitamin D by ultraviolet radiation | - |
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| ergot | (noun) a fungus that infects various cereal plants forming compact black masses of branching filaments that replace many grains of the plant; source of medicinally important alkaloids and of lysergic acid | Synonyms: Claviceps purpurea |
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| (noun) a plant disease caused by the ergot fungus | - |
| ergotamine | (noun) an alkaloid derived from ergot that is less toxic than ergot; causes constriction of blood vessels and is used to treat migraine | - |
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| ergotine | (noun) a powerful astringent alkaloid extracted from ergot as a brown, amorphous, bitter substance, used to produce contraction of the uterus. | - |
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| ergotism | (noun) poisoning by ingestion of ergot-infected grain products; characterized by thirst and diarrhea and nausea and cramping and vomiting and abnormal cardiac rhythms; in severe cases it can cause seizures and gangrene of the limbs | - |
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| ergotropism | (noun) an affinity for work | - |
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| erica | (noun) any plant of the genus Erica | Synonyms: true heath |
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| eringo | (noun) any plant of the genus Eryngium | Synonyms: eryngo |
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| eriogonum | (noun) any plant of the genus Eriogonum with small clustered flowers | - |
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| eriometer | (noun) An instrument for measuring the diameters of minute particles or fibers, from the size of the colored rings produced by the diffraction of the light in which the objects are viewed. | - |
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| eristic | (noun) the art of logical disputation (especially if specious) | - |
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| (noun) a person who disputes; who is good at or enjoys controversy | Synonyms: controversialist, disputant |
| ermine | (noun) mustelid of Northern Hemisphere in its white winter coat | Synonyms: Mustela erminea, shorttail weasel |
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| (noun) the expensive white fur of the ermine | - |
| ern | (noun) bulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland | Synonyms: erne, European sea eagle, gray sea eagle, grey sea eagle, Haliatus albicilla, white-tailed sea eagle |
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| erne | (noun) bulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland | Synonyms: ern, European sea eagle, gray sea eagle, grey sea eagle, Haliatus albicilla, white-tailed sea eagle |
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| eroding | (noun) (geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively | Synonyms: eating away, erosion, wearing, wearing away |
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| eros | (noun) a desire for sexual intimacy | Synonyms: concupiscence, physical attraction, sexual desire |
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| erosion | (noun) (geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively | Synonyms: eating away, eroding, wearing, wearing away |
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| (noun) erosion by chemical action | Synonyms: corroding, corrosion |
| (noun) a gradual decline of something | - |
| (noun) condition in which the earth's surface is worn away by the action of water and wind | - |
| erosiveness | (noun) The state or quality of causing or tending to wear away or erode. | - |
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| erotic | (noun) an erotic person | - |
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| erotica | (noun) creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire | Synonyms: porn, porno, pornography, smut |
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| eroticism | (noun) the arousal of feelings of sexual desire | Synonyms: amativeness, amorousness, erotism, sexiness |
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| (noun) a state of anticipation of sexuality | Synonyms: erotism |
| erotism | (noun) the arousal of feelings of sexual desire | Synonyms: amativeness, amorousness, eroticism, sexiness |
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| (noun) a state of anticipation of sexuality | Synonyms: eroticism |
| 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 | - |
| errand | (noun) a short trip that is taken in the performance of a necessary task or mission | - |
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| erratum | (noun) a mistake in printed matter resulting from mechanical failures of some kind | Synonyms: literal, literal error, misprint, typo, typographical error |
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| erroneousness | (noun) inadvertent incorrectness | Synonyms: error |
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| error | (noun) a wrong action attributable to bad judgment or ignorance or inattention | Synonyms: fault, mistake |
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| (noun) (baseball) a failure of a defensive player to make an out when normal play would have sufficed | Synonyms: misplay |
| (noun) inadvertent incorrectness | Synonyms: erroneousness |
| (noun) departure from what is ethically acceptable | Synonyms: wrongdoing |
| (noun) a misconception resulting from incorrect information | Synonyms: erroneous belief |
| (noun) part of a statement that is not correct | Synonyms: mistake |
| (noun) (computer science) the occurrence of an incorrect result produced by a computer | Synonyms: computer error |
| ersatz | (noun) an artificial or inferior substitute or imitation | - |
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| eructation | (noun) a reflex that expels gas noisily from the stomach through the mouth | Synonyms: belch, belching, burp, burping |
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| (noun) (of volcanoes) pouring out fumes or lava (or a deposit so formed) | Synonyms: eruption, extravasation |
| eruditeness | (noun) profound scholarly knowledge | Synonyms: encyclopaedism, encyclopedism, erudition, learnedness, learning, scholarship |
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| erudition | (noun) profound scholarly knowledge | Synonyms: encyclopaedism, encyclopedism, eruditeness, learnedness, learning, scholarship |
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| eruption | (noun) the sudden occurrence of a violent discharge of steam and volcanic material | Synonyms: volcanic eruption |
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| (noun) a sudden very loud noise | Synonyms: bam, bang, blast, clap |
| (noun) the emergence of a tooth as it breaks through the gum | - |
| (noun) a sudden violent spontaneous occurrence (usually of some undesirable condition) | Synonyms: irruption, outbreak |
| (noun) (of volcanoes) pouring out fumes or lava (or a deposit so formed) | Synonyms: eructation, extravasation |
| (noun) symptom consisting of a breaking out and becoming visible | - |
| erwinia | (noun) rod-shaped motile bacteria that attack plants | - |
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| eryngo | (noun) any plant of the genus Eryngium | Synonyms: eringo |
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| erysipelas | (noun) an acute streptococcal infection characterized by deep-red inflammation of the skin and mucous membranes | - |
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| erythema | (noun) abnormal redness of the skin resulting from dilation of blood vessels (as in sunburn or inflammation) | - |
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| erythrina | (noun) any of various shrubs or shrubby trees of the genus Erythrina having trifoliate leaves and racemes of scarlet to coral red flowers and black seeds; cultivated as an ornamental | Synonyms: coral tree |
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| erythrite | (noun) a reddish mineral consisting of hydrated cobalt arsenate in monoclinic crystalline form and used in coloring glass; usually found in veins bearing cobalt and arsenic | Synonyms: cobalt bloom |
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| erythroblast | (noun) a nucleated cell in bone marrow from which red blood cells develop | - |
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| erythroblastosis | (noun) a blood disease characterized by the abnormal presence of erythroblasts in the blood | - |
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| 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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| erythroderma | (noun) any skin disorder involving abnormal redness | - |
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| erythrolysin | (noun) any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin | Synonyms: erythrocytolysin, haemolysin, hemolysin |
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| erythromycin | (noun) an antibiotic (trade name Erythrocin or E-Mycin or Ethril or Ilosone or Pediamycin) obtained from the actinomycete Streptomyces erythreus; effective against many Gram-positive bacteria and some Gram-negative | Synonyms: E-Mycin, Erythrocin, Ethril, Ilosone, Pediamycin |
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| erythropoiesis | (noun) the process of producing red blood cells by the stem cells in the bone marrow | - |
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| erythropoietin | (noun) a glycoprotein secreted by the kidneys that stimulates the production of red blood cells | - |
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