serpent (n.)youdaoicibaDictYouDict[serpent 词源字典]
c. 1300, "limbless reptile," also the tempter in Gen. iii:1-5, from Old French serpent, sarpent "snake, serpent" (12c.), from Latin serpentem (nominative serpens) "snake; creeping thing," also the name of a constellation, from present participle of serpere "to creep," from PIE *serp- "to crawl, creep" (cognates: Sanskrit sarpati "creeps," sarpah "serpent;" Greek herpein "to creep," herpeton "serpent;" Albanian garper "serpent").

Used figuratively of things spiral or regularly sinuous, such as a type of musical instrument (1730). Serpent's tongue as figurative of venomous or stinging speech is from mistaken medieval notion that the serpent's tongue was its "sting." Serpent's tongue also was a name given to fossil shark's teeth (c. 1600).[serpent etymology, serpent origin, 英语词源]
serpentine (n.)youdaoicibaDictYouDict
c. 1400, "plant reputed to contain antivenom," from Old French serpentin name of a precious stone, noun use of adjective meaning "of a snake, snake-like; sly, deceptive," from Late Latin serpentius "of a serpent," from Latin serpentem (nominative serpens) "snake" (see serpent). As the name of a greenish igneous rock consisting mainly of hydrous magnesium silicate, attested from early 15c.
serpentine (adj.)youdaoicibaDictYouDict
"twisting, winding," 1610s; see serpent + -ine (1). An earlier adjective meaning "having the evil qualities of a serpent" is recorded from late 14c., from the French source of serpentine (n.). The winding lake of that name in Hyde Park, London, was constructed in 1730.
serrate (adj.)youdaoicibaDictYouDict
"notched," 1660s, from Latin serratus "sawlike, notched like a saw," from serra "a saw," of unknown origin. Related: Serrated; serrating.
serrated (adj.)youdaoicibaDictYouDict
1703, past participle adjective based on Latin serratus (see serrate (adj.)). Serrating "sawing" attested from 1590s, but serrate as a transitive verb not attested before 1750 according to OED.
serration (n.)youdaoicibaDictYouDict
"condition of being serrated," 1808, noun of state from serrate (adj.).
serried (adj.)youdaoicibaDictYouDict
"pressed close together," 1667 (in "Paradise Lost"), probably a past participle adjective from serry "to press close together" (1580s), a military term, from Middle French serre "close, compact" (12c.), past participle of serrer "press close, fasten," from Vulgar Latin *serrare "to bolt, lock up," from Latin serare, from sera "a bolt, bar, cross-bar," perhaps from PIE *ser- (3) "to line up" (see series). Modern use is due to the popularity of Scott, who used it with phalanx.
serum (n.)youdaoicibaDictYouDict
1670s, "watery animal fluid," from Latin serum "watery fluid, whey," from PIE root *ser- (2) "to run, flow" (cognates: Greek oros "whey;" Sanskrit sarah "flowing," sarit "brook, river"). First applied 1893 to blood serum used in medical treatments.
serval (n.)youdaoicibaDictYouDict
African wild cat, 1771, from Modern Latin serval, French serval (Buffon, 1765), from Portuguese (lobo) cerval "lynx," from Latin lupus cervarius (source of French loup cervier) "lynx," literally "wolf that hunts the stag," from cervarius "pertaining to a stag," from cervus "stag," from PIE *ker-wo- "having horns," suffixed form of root *ker- (1) "horn, head" (see horn (n.)).
servant (n.)youdaoicibaDictYouDict
c. 1200, "personal or domestic attendant," from Old French servant "servant; foot-soldier," noun use of servant "serving, waiting," present participle of servir "to attend, wait upon" (see serve (v.)).

Meaning "professed lover, one devoted to the service of a lady" is from mid-14c. In North American colonies and U.S., the usual designation for "slave" 17c.-18c. (in 14c.-15c. and later in Biblical translations the word often was used to render Latin servus, Greek doulos "slave"). Public servant is attested from 1670s.
serve (v.)youdaoicibaDictYouDict
late 12c., "to render habitual obedience to," also "minister, give aid, give help," from Old French servir "to do duty toward, show devotion to; set table, serve at table; offer, provide with," from Latin servire "be a servant, be in service, be enslaved;" figuratively "be devoted; be governed by; comply with; conform; flatter," originally "be a slave," related to servus "slave," perhaps from Etruscan (compare Etruscan proper names Servi, Serve, Latinized as Servius).

By c. 1200 also as "to be in the service of, perform a service for; attend upon, be personal servant to; be a slave; owe allegiance to; officiate at Mass or other religious rites;" from early 13c. as "set food at table;" mid-14c. as "to wait on (customers)." From late 14c. as "treat (someone or something) in some fashion." To serve (someone) right "to treat as he deserves" is recorded from 1580s.
He no schuld neuer wond
To seruen him fro fot to hond
["Amis and Amiloun," c. 1330]
Sense of "be useful, be beneficial, be suitable for a purpose or function" is from early 14c.; that of "take the place or meet the needs of, be equal to the task" is from late 14c.; that of "suffice" is from mid-15c. Meaning "render active military service" is from 1510s. Sporting sense, in tennis, badminton, etc., first recorded 1580s. Legal sense "present" (a writ, warrant,etc.), "give legal notice of" is from early 15c.
serve (n.)youdaoicibaDictYouDict
1680s, in sports (tennis, etc.), from serve (v.).
served (adj.)youdaoicibaDictYouDict
"found guilty, convicted; ordered to be punished or transported; beaten," 1811, slang past participle adjective from serve (v.).
server (n.)youdaoicibaDictYouDict
late 14c., agent noun from serve (v.). Computer sense by 1992.
servery (n.)youdaoicibaDictYouDict
1893, from serve + -ery.
ServianyoudaoicibaDictYouDict
1754 (n.), 1723 (adj.), from Medieval Latin Servia, from Serb Serb (see Serb).
service (n.1)youdaoicibaDictYouDict
c. 1100, "celebration of public worship," from Old French servise "act of homage; servitude; service at table; Mass, church ceremony," from Latin servitium "slavery, condition of a slave, servitude," also "slaves collectively," from servus "slave" (see serve (v.)).

Meaning "act of serving, occupation of an attendant servant" is attested from c. 1200, as is that of "assistance, help; a helpful act." From c. 1300 as "provision of food; sequence of dishes served in a meal;" from late 14c. as "service at table, attendance during a meal." Meaning "the furniture of the table" (tea service, etc.) is from mid-15c.

Meanings "state of being bound to undertake tasks for someone or at someone's direction; labor performed or undertaken for another" are mid-13c. Sense of "service or employment in a court or administration" is from c. 1300, as is that of "military service (especially by a knight); employment as a soldier;" hence "the military as an occupation" (1706).

Also in Middle English "sexual intercourse, conjugal relations" (mid-15c.; service of Venus, or flesh's service). Service industry (as distinct from production) attested from 1938. A service station originally was a gas stop that also repaired cars.
service (v.)youdaoicibaDictYouDict
1893, "to provide with service," from service (n.1). Meaning "perform work on" first recorded 1926. Related: Serviced; servicing.
service (n.2)youdaoicibaDictYouDict
type of tree or berry, extended form of serve (perhaps via Middle English plural serves being taken as a singular), from Old English syrfe, Old French sorbe, both from Vulgar Latin *sorbea, from Latin sorbus (see sorb).
serviceable (adj.)youdaoicibaDictYouDict
"ready to do service," early 14c., from Old French servicable, from servise (see service (n.1)). Related: Serviceability.
Edgar: I know thee well: a serviceable villain,
As duteous to the vices of thy mistress
As badness would desire.
["King Lear," IV.vi.]