Septuagint (n.)youdaoicibaDictYouDict[Septuagint 词源字典]
"Greek version of the Old Testament," 1630s, earlier as the word for the translators collectively (1570s), from Late Latin septuaginta (interpretes) "seventy (interpreters)," from Latin septuaginta "seventy," from septem "seven" (see seven) + -ginta "tens, ten times," from PIE *dkm-ta-, from *dekm- "ten" (see ten).

So called in reference to the (incorrect) tradition that the translation was done 3c. B.C.E. by 70 or 72 Jewish scholars (in Middle English, the Seuenty turneres) from Palestine and completed in 70 or 72 days. The translation is believed now to have been carried out at different times by an undetermined number of Egyptian Jews. Often denoted by Roman numerals, LXX. Related: Septuagintal.[Septuagint etymology, Septuagint origin, 英语词源]
septum (n.)youdaoicibaDictYouDict
"partition between the nostrils," 1690s, Modern Latin, from Latin saeptum "a fence, enclosure, partition," from neuter past participle of saepire "to hedge in," from saepes "hedge, fence." Related: Septal.
sepulchral (adj.)youdaoicibaDictYouDict
1610s, "pertaining to a burial or place of burial," from Latin sepulcralis "of a tomb, sepulchral," from sepulcrum (see sepulchre) + -al (1). Transferred sense of "gloomy" is from 1711. Related: Sepulchrally.
sepulchre (n.)youdaoicibaDictYouDict
also sepulcher, c. 1200, "tomb, burial place," especially the cave where Jesus was buried outside Jerusalem (Holy Sepulcher or Saint Sepulcher), from Old French sepulcre "tomb; the Holy Sepulchre" (11c.), from Latin sepulcrum "grave, tomb, place where a corpse is buried," from root of sepelire "to bury, embalm," originally "to perform rituals on a corpse," from PIE *sep-el-yo-, suffixed form of root *sep- (2) "to handle (skillfully), to hold (reverently);" cognates: Sanskrit saparyati "honors." No reason for the -ch- spelling, which dates to 13c. Whited sepulchre "hypocrite" is from Matt. xxiii.27.
sepulture (n.)youdaoicibaDictYouDict
"burial, interment," late 13c., from Old French sepulture, sepoutre "tomb, coffin" (12c.), from Latin sepultura "burial, funeral obsequies," from sepult-, past participle stem of sepelire "to bury" (see sepulchre).
sequacious (adj.)youdaoicibaDictYouDict
"given to following leaders," 1630s, from Latin sequac-, stem of sequax "that follows, following, seeking after," from sequi "to follow" (see sequel) + -ous. Related: Sequaciously; sequaciousness; sequacity (1620s).
sequel (n.)youdaoicibaDictYouDict
early 15c., "train of followers," from Old French sequelle (14c.), from Late Latin sequela "that which follows, result, consequence," from sequi "to follow, come after, follow after, attend, follow naturally," from PIE root *sekw- (1) "to follow" (cognates: Sanskrit sacate "accompanies, follows," Avestan hacaiti, Greek hepesthai "to follow," Lithuanian seku "to follow," Latin secundus "second, the following," Old Irish sechim "I follow"). Meaning "consequence" is attested from late 15c. Meaning "story that follows and continues another" first recorded 1510s.
sequela (n.)youdaoicibaDictYouDict
plural sequelae, 1793, originally in pathology, from Latin sequela "that which follows, consequence" (see sequel).
sequence (n.)youdaoicibaDictYouDict
late 14c., "hymn sung after the Hallelujah and before the Gospel," from Old French sequence "answering verses" (13c.), from Medieval Latin sequentia "a following, a succession," from Latin sequentem (nominative sequens), present participle of sequi "to follow" (see sequel). In Church use, a partial loan-translation of Greek akolouthia, from akolouthos "following." General sense of "succession," also "a sequence at cards," appeared 1570s.
sequence (v.)youdaoicibaDictYouDict
"arrange in a sequence," 1954, from sequence (n.). Related: Sequenced; sequencing.
sequent (adj.)youdaoicibaDictYouDict
1550s, "following," from Old French sequent "following, subsequent," from Latin sequentem (nominative sequens) "next, following," present participle of sequi "to follow" (see sequel). As a noun from 1580s.
sequential (adj.)youdaoicibaDictYouDict
1816, from Late Latin sequentia (see sequence) + -al (1). Related: Sequentially.
sequester (v.)youdaoicibaDictYouDict
late 14c., "remove" something, "quarantine, isolate" (someone); "excommunicate;" also intransitive, "separate oneself from," from Old French sequestrer (14c.), from Late Latin sequestrare "to place in safekeeping," from Latin sequester "trustee, mediator," noun use of an adjective meaning "intermediate," which probably is related to sequi "to follow" (see sequel). Meaning "seize by authority, confiscate" is first attested 1510s. Alternative sequestrate (v.) is early 15c., from Latin sequestratus. Related: Sequestered; sequestering.
sequestration (n.)youdaoicibaDictYouDict
c. 1400, from Late Latin sequestrationem (nominative sequestratio) "a depositing," noun of action from past participle stem of Latin sequestrare (see sequester).
sequin (n.)youdaoicibaDictYouDict
1610s, name of a former Italian and Turkish gold coin, from French sequin (17c.), from Italian zecchino, name of a Venetian coin, from zecca "a mint," from Arabic sikkah "a minting die." Meaning "ornamental disc or spangle" is first recorded 1882, from resemblance to a gold coin. Related: Sequined (1890).
sequituryoudaoicibaDictYouDict
Latin, literally "it follows."
sequoia (n.)youdaoicibaDictYouDict
large American coniferous tree, 1857, from Modern Latin tree genus name given 1847 by Austrian botanist Stephan Endlicher (1804-1849), originally to a different tree, the coast redwood, apparently in honor of Sequoya (a.k.a. George Guess, 1760-1843), Cherokee man who invented a system of writing for his people's language, whose name is from Cherokee (Iroquoian) Sikwayi, a word of unknown etymology.

Endlicher was a specialist in conifers, and he also was a philologist. But he never gave an etymology of this name and a search of his papers discovered no mention of Sequoya or the Cherokee writing system, and the connection is an assumption that some botanists have challenged, though no better candidate for a source has yet been found.

The giant sequoia was unseen by Europeans until 1833 and unknown to scientists until 1852. In May 1855, a pair of American botanists named it Taxodium giganteum, but that name was deemed inappropriate for several scientific reasons. Meanwhile, English botanist John Lindley, who had never been to California, in 1853 named it Wellingtonia in honor of the Duke of Wellington. "As high as Wellington towers above his contemporaries, as high towers this California tree above the forest surrounding it. Therefore, it shall bear for all time to come the name Wellingtonia gigantea." This sat poorly with the Americans, and much ink was spilled until a French botanist provided the solution by transferring Endlicher's name. In Britain still popularly called Wellingtonia.
seraglio (n.)youdaoicibaDictYouDict
"harem," also the name of a former palace of the sultan in Istanbul, 1580s, from Italian seraglio, alteration of Turkish saray "palace, court," from Persian sara'i "palace, inn," from Iranian base *thraya- "to protect" (cognates: Avestan thrayeinti "they protect"), from PIE *tra-, variant form of root *tere- (2) "to cross over, pass through, overcome" (see through).

The Italian word probably reflects folk etymology influence of serraglio "enclosure, cage," from Medieval Latin serraculum "bung, stopper" (see serried).
serape (n.)youdaoicibaDictYouDict
also sarape, type of shawl for men, 1834, from Mexican Spanish sarape, probably from Nahuatl, but exact source difficult to identify source because there is no -r- sound in Nahuatl.
seraph (n.)youdaoicibaDictYouDict
1667, first used by Milton (probably on analogy of cherub/cherubim), back-formed singular from Old English seraphim (plural), from Late Latin seraphim, from Greek seraphim, from Hebrew seraphim (only in Isa. vi), plural of *saraph (which does not occur in the Bible), probably literally "the burning one," from saraph "it burned." Seraphs were traditionally regarded as burning or flaming angels, though the word seems to have some etymological sense of "flying," perhaps from confusion with the root of Arabic sharafa "be lofty." Some scholars identify it with a word found in other passages interpreted as "fiery flying serpent."