sewage (n.)youdaoicibaDictYouDict[sewage 词源字典]
1818, from sew (v.) "to drain, draw off water" (late 15c., from sewer (n.1)) + -age.[sewage etymology, sewage origin, 英语词源]
sewer (n.1)youdaoicibaDictYouDict
c. 1400, "conduit," from Anglo-French sewere, Old North French sewiere "sluice from a pond" (13c.), literally "something that makes water flow," from shortened form of Gallo-Roman *exaquaria (source of Middle French esseveur), from Latin ex- "out" (see ex-) + aquaria, fem. of aquarius "pertaining to water," from aqua "water" (see aqua-).

Specifically of underground channels for wastewater from c. 1600; figurative use of this is from 1640s.
sewer (n.2)youdaoicibaDictYouDict
"one who sews," late 14c., agent noun from sew (v.).
sewerage (n.)youdaoicibaDictYouDict
1832, from sewer (n.1) + -age.
sewing (n.)youdaoicibaDictYouDict
late 13c., "action of sewing;" c. 1400, "sewn work," verbal noun from sew (v.). Sewing machine is attested from 1847.
sex (n.)youdaoicibaDictYouDict
late 14c., "males or females collectively," from Latin sexus "a sex, state of being either male or female, gender," of uncertain origin. "Commonly taken with seco as division or 'half' of the race" [Tucker], which would connect it to secare "to divide or cut" (see section (n.)). Meaning "quality of being male or female" first recorded 1520s. Meaning "sexual intercourse" first attested 1929 (in writings of D.H. Lawrence); meaning "genitalia" is attested from 1938. Sex appeal attested by 1904.
For the raw sex appeal of the burlesque "shows" there is no defense, either. These "shows" should be under official supervision, at the least, and boys beneath the age of eighteen forbidden, perhaps, to attend their performance, just as we forbid the sale of liquors to minors. [Walter Prichard Eaton, "At the New Theatre and Others: The American Stage, Its Problems and Performances," Boston, 1910]
Sex drive is from 1918; sex object is 1901; sex symbol is 1871 in anthropology; the first person to whom the term was applied seems to have been Marilyn Monroe (1959). Sex therapist is from 1974.
sex (v.)youdaoicibaDictYouDict
1884, "to determine the sex of," from sex (n.); to sex (something) up "increase the sex appeal of" is recorded from 1942. Related: Sexed; sexing.
sexagenarian (n.)youdaoicibaDictYouDict
1738, "person sixty years old," from Latin sexagenarius "containing sixty," from sexagenarius, from sexageni "sixty each, sixty at a time," from sexaginta "sixty," from comb. form of sex (see six) + -genaria "ten times," from -ginta "tens," from PIE *dkm-ta-, from *dekm- "ten" (see ten). As an adjective from 1836.
sexagesimal (adj.)youdaoicibaDictYouDict
"pertaining to 60," 1680s, from Medieval Latin sexagesimalis, from Latin sexagesimus "the sixtieth," from sexaginta "sixty."
sexiness (n.)youdaoicibaDictYouDict
1922, from sexy + -ness.
sexism (n.)youdaoicibaDictYouDict
1968; see sexist + -ism.
sexist (adj.)youdaoicibaDictYouDict
1965, from sex (n.) on model of racist, coined by Pauline M. Leet, director of special programs at Franklin & Marshall College, Lancaster, Pennsylvania, U.S., in a speech which was circulated in mimeograph among feminists. Popularized by use in print in Caroline Bird's introduction to "Born Female" (1968).
sexless (adj.)youdaoicibaDictYouDict
1590s, from sex (n.) + -less. Related: Sexlessly; sexlessness.
sexology (n.)youdaoicibaDictYouDict
1902, from sex (n.) + -ology. Related: Sexologist.
sexpert (n.)youdaoicibaDictYouDict
"sex therapist," 1924, from jocular merger of sex (n.) + expert.
sexploitation (n.)youdaoicibaDictYouDict
1942, from sex (n.) + exploitation. Other similar coinages include sexpert (1924); sexcapade (1953); sexational (1927); and sexophone in "Brave New World."
sexpot (n.)youdaoicibaDictYouDict
"erotically willing and desirable female," 1929, from sex (n.) + pot (n.1), perhaps suggested by fleshpot.
sext (v.)youdaoicibaDictYouDict
by 2005, from contraction of sex (n.) + text (v.). Related: Sexted; sexting.
sext (n.)youdaoicibaDictYouDict
early 15c., "third of the lesser canonical hours," from Latin sexta (hora), fem. of sextus, ordinal of sex (see six).
sextant (n.)youdaoicibaDictYouDict
instrument for determining latitude, 1620s, from Modern Latin sextans, said to have been coined c. 1600 by Danish astronomer Tycho Brahe, from Latin sextans "a sixth," from sex "six" (see six). So called because the sextans has a graduated arc equal to a sixth part of a circle.