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elongate (v.)[elongate 词源字典]: "to make long or longer," 1530s, from Late Latin elongatus, past participle of elongare "to prolong, protract" (see elongation). Earlier in the same sense was elongen (mid-15c.). Related: Elongated; elongating.[elongate etymology, elongate origin, 英语词源]
elongation (n.): late 14c., from Medieval Latin elongationem (nominative elongatio), noun of action from past participle stem of Late Latin elongare "remove to a distance," from Latin ex- "out" (see ex-) + longus "long" (see long (adj.)).
elope (v.): 1590s, "to run off," probably from Middle Dutch (ont)lopen "run away," from ont- "away from" (from Proto-Germanic *und- which also gave the first element in until) + lopen "to run," from Proto-Germanic *hlaupan (source also of Old English hleapan; see leap (v.)). Sense of "run away in defiance of parental authority to marry secretly" is 19c.

In support of this OED compares Old English uðleapan, "the technical word for the 'escaping' of a thief." However there is an Anglo-French aloper "run away from a husband with one's lover" (mid-14c.) which complicates this etymology; perhaps it is a modification of the Middle Dutch word, with Old French es-, or it is a compound of that and Middle English lepen "run, leap" (see leap (v.)).

The oldest Germanic word for "wedding" is represented by Old English brydlop (cognates: Old High German bruthlauft, Old Norse bruðhlaup), literally "bride run," the conducting of the woman to her new home. Related: Eloped; eloping.
elopement (n.): 1540s, from elope + -ment. (The word was in Anglo-French in 14c. as alopement).
eloquence (n.): late 14c., from Old French eloquence (12c.), from Latin eloquentia, from eloquentem (nominative eloquens) "eloquent," present participle of eloqui "speak out," from ex- "out" (see ex-) + loqui "to speak" (see locution). Earlier in same sense was eloquency (mid-14c.).
eloquent (adj.): late 14c., from Old French eloquent, from Latin eloquentem (nominative eloquens) "speaking, having the faculty of speech; eloquent," present participle of eloqui "to speak out" (see eloquence). Related: Eloquently.
Elsa: fem. proper name, from German diminutive of Elisabet (see Elizabeth).
else (adv.): Old English elles "in another manner, other, otherwise, besides, different," from Proto-Germanic *aljaz (cognates: Gothic aljis "other," Old High German eli-lenti, Old English el-lende, both meaning "in a foreign land;" see also Alsace), an adverbial genitive of the neuter of PIE root *al- (1) "beyond" (cognates: Greek allos "other," Latin alius; see alias (adv.)). As a quasi-adjective, synonymous with other, from 1660s; the nuances of usage are often arbitrary.

Productive of a number of handy compounds that somehow never got traction or have been suffered to fall from use: elsehow (1660s) "somehow or other;" elsewards (adv.), 1882, "somewhere else;" Old English elsewhat (pron.) " something else, anything else;" elsewhen (adv.), early 15c., "at another time; elsewhence (c. 1600); elsewho (1540s). Among the survivors are elsewhere, elsewise. Menacing or else, with omitted but implied threat, is from 1833.
Elsevier (n.): early 18c., Elzevir (via French Elzévir), from Dutch Elsevier, the name of a family of Dutch printers famed for the accuracy and elegance of their work; especially in reference to editions of the classics and other works published by them c. 1580-1680.
elsewhere (n.): "in another place, in other places," c. 1400, elswher, from Old English elles hwær (see else + where). Related: Elsewhither (Old English elleshwider.
elsewise (adv.): "in a different manner, otherwise," 1540s, from else + -wise.
elucidate (v.): 1560s, perhaps via Middle French élucider (15c.) or directly from Late Latin elucidatus, past participle of elucidare "make light or clear," from assimilated form of ex- "out, away" (see ex-) + lucidus "clear" (see lucid). Related: Elucidated; elucidates; elucidating.
elucidation (n.): 1560s, "act of making intelligible," noun of action from elucidate. As "an explanation" from 1660s.
elude (v.): 1530s, "delude, make a fool of," from Latin eludere "finish play, win at play; escape from or parry (a blow), make a fool of, mock, frustrate; win from at play," from assimilated form of ex- "out, away" (see ex-) + ludere "to play" (see ludicrous). Sense of "evade" is first recorded 1610s in a figurative sense, 1630s in a literal one. Related: Eluded; eludes; eluding.
elusion (n.): "deception, escape by artifice or deceit," 1540s, noun of action from elude, or from Medieval Latin elusionem (nominative elusio), noun of action from past participle stem of Latin eludere.
elusive (adj.): 1719, from Latin elus-, past participle stem of eludere "elude, frustrate" (see elude) + -ive. Related: Elusiveness.
elution (n.): "washing, purification," 1610s, from Late Latin elutionem (nominative elutio) "a washing out," noun of action from past participle stem of Latin eluere "to wash out, wash off, clean," from ex- "out" (see ex-) + luere "to wash" (see lave). Especially in reference to a process of obtaining sugar from molasses.
elven (adj.): Old English -ælfen (n.) "an elf or fairy," usually a female one (see elf). Not a pure adjective in Middle English (elvish was used), but used in phrases such as elven land (c. 1300). Apparently revived as an adjective by Tolkien (1937).
elver (n.): "young eel," 1640s, variant or corruption of eelfare (1530s), literally "passage of young eels up a river;" see eel + fare (n.).
Elvira: fem. proper name, from Spanish, of Germanic origin.