singlet (n.)youdaoicibaDictYouDict[singlet 词源字典]
"unlined woolen garment," c. 1746, from single (adj.) in clothing sense of "unlined, of one thickness" (late 14c.) + -et, apparently in imitation of doublet.[singlet etymology, singlet origin, 英语词源]
singleton (n.)youdaoicibaDictYouDict
"single card of a suit in a hand," 1876, originally in whist, from single (adj.); compare simpleton, etc. Extended early 20c. to other instances of singularity.
singly (adv.)youdaoicibaDictYouDict
c. 1300, from single (adj.) + -ly (2).
singspiel (n.)youdaoicibaDictYouDict
1876, from German Singspiel, literally "a singing play," from singen "to sing" (see sing (v.)) + Spiel "a play" (see spiel). Kind of performance popular in Germany late 18c.
singular (adj.)youdaoicibaDictYouDict
mid-14c., "alone, apart; being a unit; special, unsurpassed," from Old French singuler "personal particular; distinctive; singular in number" (12c., Modern French singulier) or directly from Latin singularis "single, solitary, one by one, one at a time; peculiar, remarkable," from singulus (see single (adj.)). Meaning "remarkably good, unusual, rare, separated from others (by excellence), uncommon" is from c. 1400 in English; this also was a common meaning of Latin singularis.
singularity (n.)youdaoicibaDictYouDict
c. 1400, "unusual behavior," also "singleness of aim or purpose," from Old French singulerte "peculiarity" (12c., Modern French singularité) or directly from Late Latin singularitatem (nominative singularitas) "a being alone," from singularis (see singular (adj.)). Meaning "fact of being different from others" is c. 1500. Mathematical sense of "point at which a function takes an infinite value" is from 1893. Astronomical use is from 1965.
singularly (adv.)youdaoicibaDictYouDict
late 14c., "exclusively, alone, solely; uniquely; individually; in an unusual way, especially," from singular + -ly (2).
singultus (n.)youdaoicibaDictYouDict
Latin, "a sob; a speech broken by sobs."
Sinhalese (adj.)youdaoicibaDictYouDict
also Singhalese, "pertaining to Sri Lanka," 1797, from Sanskrit Sinhala "Sri Lanka, Ceylon," from simhala-, literally "of lions," from simhah "lion." As the name of a language spoken there, it is attested from 1801.
Sinic (adj.)youdaoicibaDictYouDict
"Chinese," 1660s, from Medieval Latin Sinicus, from Sina "China," from Late Latin Sinae (plural) "the Chinese" (see Sino-).
sinical (adj.)youdaoicibaDictYouDict
"of or relating to sines," 1590s, from sine + -ical.
Sinicism (n.)youdaoicibaDictYouDict
"Chinese ways, Chinese affectations," 1891; see Sino- + -ism. Related: Sinicize; Sinification.
sinister (adj.)youdaoicibaDictYouDict
early 15c., "prompted by malice or ill-will, intending to mislead," from Old French senestre, sinistre "contrary, false; unfavorable; to the left" (14c.), from Latin sinister "left, on the left side" (opposite of dexter), of uncertain origin. Perhaps meaning properly "the slower or weaker hand" [Tucker], but Klein and Buck suggest it's a euphemism (see left (adj.)) connected with the root of Sanskrit saniyan "more useful, more advantageous." With contrastive or comparative suffix -ter, as in dexter (see dexterity).

The Latin word was used in augury in the sense of "unlucky, unfavorable" (omens, especially bird flights, seen on the left hand were regarded as portending misfortune), and thus sinister acquired a sense of "harmful, unfavorable, adverse." This was from Greek influence, reflecting the early Greek practice of facing north when observing omens. In genuine Roman auspices, the augurs faced south and left was favorable. Thus sinister also retained a secondary sense in Latin of "favorable, auspicious, fortunate, lucky."

Meaning "evil" is from late 15c. Used in heraldry from 1560s to indicate "left, to the left." Bend (not "bar") sinister in heraldry indicates illegitimacy and preserves the literal sense of "on or from the left side" (though in heraldry this is from the view of the bearer of the shield, not the observer of it).
sinistral (adj.)youdaoicibaDictYouDict
late 15c., "unlucky," from Old French senestral, sinistral or Medieval Latin *sinistralis, from sinister (see sinister). Meaning "on the left side" is from 1803. Related: Sinistrally.
sinistrorse (adj.)youdaoicibaDictYouDict
1856, a word wanted by the botanists to describe the direction of spiral structures in nature, from Latin sinistrorsus "toward the left side," from sinister "left" (see sinister). It was paired with dextrorse but confusion over what was the proper point of view to reckon leftward or rightward spiraling prevented the word being as useful as it might have been.
sink (v.)youdaoicibaDictYouDict
Old English sincan (intransitive) "become submerged, go under, subside" (past tense sanc, past participle suncen), from Proto-Germanic *senkwan (cognates: Old Saxon sinkan, Old Norse sökkva, Middle Dutch sinken, Dutch zinken, Old High German sinkan, German sinken, Gothic sigqan), from PIE root *sengw- "to sink."

The transitive use (mid-13c.) supplanted Middle English sench (compare drink/drench) which died out 14c. Related: Sank; sunk; sinking. Sinking fund is from 1724. Adjective phrase sink or swim is from 1660s. To sink without a trace is World War I military jargon, translating German spurlos versenkt.
sink (n.)youdaoicibaDictYouDict
early 15c., "cesspool, pit for reception of wastewater or sewage," from sink (v.). Figurative sense of "place where corruption and vice abound" is from 1520s. Meaning "drain for carrying water to a sink" is from late 15c. Sense of "shallow basin (especially in a kitchen) with a drainpipe for carrying off dirty water" first recorded 1560s. In science and technical use, "place where heat or other energy is removed from a system" (opposite of source), from 1855.
sinker (n.)youdaoicibaDictYouDict
1838 in the fishing-line sense, agent noun from sink (v.).
sinkhole (n.)youdaoicibaDictYouDict
also sink-hole, mid-15c., "sewage pit," from sink (n.) + hole (n.). As a geological phenomenon, "hole made in the earth in limestone regions by underground erosion," 1780, from sink (v.).
sinless (adj.)youdaoicibaDictYouDict
Old English synleas; see sin (n.) + -less. Related: Sinlessly; sinlessness.