Webster's Dictionary, 1913

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Errant adjective [ French errant , present participle from Old French errer to travel, Late Latin iterare , from Latin iter journey; confused somewhat with Latin errare to err. See Eyre , and confer Arrant , Itinerant .]
1. Wandering; deviating from an appointed course, or from a direct path; roving.

Seven planets or errant stars in the lower orbs of heaven.
Sir T. Browne.

2. Notorious; notoriously bad; downright; arrant.

Would make me an errant fool.
B. Jonson.

3. (Eng. Law) Journeying; itinerant; - - formerly applied to judges who went on circuit and to bailiffs at large. Mozley & W.

Errant noun One who wanders about. [ Obsolete] Fuller.

Errantia noun plural [ New Latin , from Latin errare to wander. See Err .] (Zoology) A group of chætopod annelids, including those that are not confined to tubes. See Chætopoda . [ Written also Errantes .]

Errantry noun
1. A wandering; a roving; esp., a roving in quest of adventures. Addison.

2. The employment of a knight-errant. Johnson.

Errata noun plural [ Latin ] See Erratum .

Erratic adjective [ Latin erraticus , from errare to wander: confer French erratique . See Err .]
1. Having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished from the fixed stars.

The earth and each erratic world.
Blackmore.

2. Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.

3. Irregular; changeable. " Erratic fever." Harvey.

Erratic blocks , gravel, etc. (Geol.) , masses of stone which have been transported from their original resting places by the agency of water, ice, or other causes. -- Erratic phenomena , the phenomena which relate to transported materials on the earth's surface.

Erratic noun
1. One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.

2. A rogue. [ Obsolete] Cockeram.

3. (Geol.) Any stone or material that has been borne away from its original site by natural agencies; esp., a large block or fragment of rock; a bowlder.

» In the plural the term is applied especially to the loose gravel and stones on the earth's surface, including what is called drift .

Erratical adjective Erratic. -- Er*rat"ic*al*ly , adverb -- Er*rat"ic*al*ness , noun

Erration noun [ Latin erratio . See Err .] A wandering; a roving about. [ Obsolete] Cockeram.

Erratum noun ; plural Errata . [ Latin , from errare , erratum , to wander, err. See Err .] An error or mistake in writing or printing.

A single erratum may knock out the brains of a whole passage.
Cowper.

Errhine noun [ Greek ...; ... in + ..., ..., nose: confer French errhin .] (Medicine) A medicine designed to be snuffed up the nose, to promote discharges of mucus; a sternutatory. Coxe. -- adjective Causing or increasing secretion of nasal mucus.

Erroneous adjective [ Latin erroneus , from errare to err. See Err .]
1. Wandering; straying; deviating from the right course; -- hence, irregular; unnatural. [ Obsolete] " Erroneous circulation." Arbuthnot.

Stopped much of the erroneous light, which otherwise would have disturbed the vision.
Sir I. Newman.

2. Misleading; misled; mistaking. [ Obsolete]

An erroneous conscience commands us to do what we ought to omit.
Jer. Taylor.

3. Containing error; not conformed to truth or justice; incorrect; false; mistaken; as, an erroneous doctrine; erroneous opinion, observation, deduction, view, etc. -- Er*ro"ne*ous*ly , adverb -- Er*ro"ne*ous*ness , noun

Error noun [ Old French error , errur , French erreur , Latin error , from errare to err. See Err .]
1. A wandering; a roving or irregular course. [ Obsolete]

The rest of his journey, his error by sea.
B. Jonson.

2. A wandering or deviation from the right course or standard; irregularity; mistake; inaccuracy; something made wrong or left wrong; as, an error in writing or in printing; a clerical error .

3. A departing or deviation from the truth; falsity; false notion; wrong opinion; mistake; misapprehension.

H... judgment was often in error , though his candor remained unimpaired.
Bancroft.

4. A moral offense; violation of duty; a sin or transgression; iniquity; fault. Ps. xix. 12.

5. (Math.) The difference between the approximate result and the true result; -- used particularly in the rule of double position.

6. (Mensuration) (a) The difference between an observed value and the true value of a quantity. (b) The difference between the observed value of a quantity and that which is taken or computed to be the true value; -- sometimes called residual error .

7. (Law.) A mistake in the proceedings of a court of record in matters of law or of fact.

8. (Baseball) A fault of a player of the side in the field which results in failure to put out a player on the other side, or gives him an unearned base.

Law of error , or Law of frequency of error (Mensuration) , the law which expresses the relation between the magnitude of an error and the frequency with which that error will be committed in making a large number of careful measurements of a quantity. -- Probable error . (Mensuration) See under Probable . -- Writ of error (Law) , an original writ, which lies after judgment in an action at law, in a court of record, to correct some alleged error in the proceedings, or in the judgment of the court. Bouvier. Burrill.

Syn. -- Mistake; fault; blunder; failure; fallacy; delusion; hallucination; sin. See Blunder .

Errorful adjective Full of error; wrong. Foxe.

Errorist noun One who encourages and propagates error; one who holds to error.

Ers (ẽrs) noun [ French, from Latin ervum a kind of pulse, bitter vetch.] (Botany) The bitter vetch ( Ervum Ervilia ).

Erse (ẽrs) noun [ A modification of Irish , Middle English Irishe .] A name sometimes given to that dialect of the Celtic which is spoken in the Highlands of Scotland; -- called, by the Highlanders, Gaelic .

Erse adjective Of or pertaining to the Celtic race in the Highlands of Scotland, or to their language.

Ersh (ẽrsh) noun See Arrish .

Erst (ẽrst) adverb [ Orig. superlative of ere ; Anglo-Saxon ǣrest . See Ere .] [ Archaic]
1. First. Chaucer.

2. Previously; before; formerly; heretofore. Chaucer.

Tityrus, with whose style he had erst disclaimed all ambition to match his pastoral pipe.
A. W. Ward.

At erst , at first; at the beginning. -- Now at erst , at this present time. Chaucer.

Erstwhile (-hwīl") adverb Till then or now; heretofore; formerly. [ Archaic]

Erubescence (?; 135), Er`u*bes"cen*cy noun [ Latin erubescentia : confer French érubescence .] The act of becoming red; redness of the skin or surface of anything; a blushing.

Erubescent adjective [ Latin erubescens , present participle erubescere to grow red; e out + rubescere . See Rubescent .] Red, or reddish; blushing. Johnson.

Erubescite noun (Min.) See Bornite .

Eruca noun ; plural Erucæ . [ Latin , a caterpillar, also, a sort of colewort.] (Zoology) An insect in the larval state; a caterpillar; a larva.

Erucic adjective (Chemistry) Pertaining to, or derived from, a genus of cruciferous Mediterranean herbs ( Eruca or Brassica ); as, erucic acid, a fatty acid resembling oleic acid, and found in colza oil, mustard oil, etc.

Erucifrom adjective [ Eruca + -form .] (Zoology) Having the form of a caterpillar; -- said of insect larvæ.

Eruct, Eructate transitive verb [ Latin eructare ; e out + ructare to belch: confer French éructer .] To eject, as wind, from the stomach; to belch. [ R.] Howell.

Eructation noun [ Latin eructatio : confer French éructation .]
1. The act of belching wind from the stomach; a belch.

2. A violent belching out or emitting, as of gaseous or other matter from the crater of a volcano, geyser, etc.

Erudiate transitive verb [ Latin erudire .] To instruct; to educate; to teach. [ Obsolete]

The skillful goddess there erudiates these
In all she did.
Fanshawe.

Erudite (ĕr"u*dīt; 135) adjective [ Latin eruditus , past participle of erudire to free from rudeness, to polish, instruct; e out + rudis rude: confer French érudit . See Rude .] Characterized by extensive reading or knowledge; well instructed; learned. "A most erudite prince." Sir T. More. " Erudite . . . theology." I. Taylor. -- Er"u*dite`ly , adverb -- Er"u*dite`ness , noun

Erudition (-dĭsh"ŭn) noun [ Latin eruditio : confer French érudition .] The act of instructing; the result of thorough instruction; the state of being erudite or learned; the acquisitions gained by extensive reading or study; particularly, learning in literature or criticism, as distinct from the sciences; scholarship.

The management of a young lady's person is not be overlooked, but the erudition of her mind is much more to be regarded.
Steele.

The gay young gentleman whose erudition sat so easily upon him.
Macaulay.

Syn. -- Literature; learning. See Literature .

Erugate adjective [ Latin erugatus , past participle of erugare to smooth; e out + ruga wrinkle.] Freed from wrinkles; smooth.

Eruginous adjective [ Confer French érugineux . See Æruginous .] Partaking of the substance or nature of copper, or of the rust copper; resembling the trust of copper or verdigris; æruginous.

Erumpent adjective [ Latin erumpens , -entis , present participle of erumpere .] (Botany) Breaking out; -- said of certain fungi which burst through the texture of leaves.

Erupt transitive verb [ See Eruption .] To cause to burst forth; to eject; as, to erupt lava. Huxley.

Erupt intransitive verb [ See Eruption .]
1. To eject something, esp. lava, water, etc., as a volcano or geyser.

2. To burst forth; to break out, as ashes from a volcano, teeth through the gums, etc.

When the amount and power of the steam is equal to the demand, it erupts with violence through the lava flood and gives us a small volcano.
H. J. W. Dam.

Eruption noun [ Latin eruptio , from erumpere , eruptum , to break out; e out + rumpere , to break: confer French éruption . See Rupture .]
1. The act of breaking out or bursting forth; as: (a) A violent throwing out of flames, lava, etc., as from a volcano of a fissure in the earth's crust. (b) A sudden and overwhelming hostile movement of armed men from one country to another. Milton. (c) A violent commotion.

All Paris was quiet . . . to gather fresh strength for the next day's eruption .
W. Irving.

2. That which bursts forth.

3. A violent exclamation; ejaculation.

He would . . . break out into bitter and passionate eruditions .
Sir H. Wotton.

4. (Medicine) The breaking out of pimples, or an efflorescence, as in measles, scarlatina, etc.

Eruptional adjective Eruptive. [ R.] R. A. Proctor.

Eruptive adjective [ Confer French éruptif .]
1. Breaking out or bursting forth.

The sudden glance
Appears far south eruptive through the cloud.
Thomson.

2. (Medicine) Attended with eruption or efflorescence, or producing it; as, an eruptive fever.

3. (Geol.) Produced by eruption; as, eruptive rocks, such as the igneous or volcanic.

Eruptive noun (Geol.) An eruptive rock.

Eryngium (e*rĭn"jĭ*ŭm) noun [ New Latin , from Greek 'hry`ggion , dim. of 'h`ryggos eryngo; confer Latin eryngion , erynge .] (Botany) A genus of umbelliferous plants somewhat like thistles in appearance. Eryngium maritimum , or sea holly, has been highly esteemed as an aphrodisiac, the roots being formerly candied.

Eryngo noun (Botany) A plant of the genus Eryngium.

Erysipelas noun [ Latin , from Greek 'erysi`pelas ; 'eryqro`s red + pe`lla hide, skin. See Red , and Pell , noun ] (Medicine) St. Anthony's fire; a febrile disease accompanied with a diffused inflammation of the skin, which, starting usually from a single point, spreads gradually over its surface. It is usually regarded as contagious, and often occurs epidemically.

Erysipelatoid adjective [ Greek 'erysi`pelas erysipelas + -oid .] Resembling erysipelas.

Erysipelatous adjective [ Confer French érysipélateux .] Resembling erysipelas, or partaking of its nature.

Erysipelous adjective Erysipelatous.

Erythema noun [ New Latin , from Greek ..., from ... to redden, from 'eryqro`s red.] (Medicine) A disease of the skin, in which a diffused inflammation forms rose-colored patches of variable size.

Erythematic adjective [ Confer French érythématique .] (Medicine) Characterized by, or causing, a morbid redness of the skin; relating to erythema.

Erythematous adjective (Medicine) Relating to, or causing, erythema.