Polack (n.)youdaoicibaDictYouDict[Polack 词源字典]
"Polish person," 1570s, from Polish Polak "(male) Polish person," related to Polanie "Poles," Polska "Poland," polski "Polish" (see Pole). In North American usage, "Polish immigrant, person of Polish descent" (1879) and in that context considered offensive in English. As an adjective from c. 1600.[Polack etymology, Polack origin, 英语词源]
Poland (n.)youdaoicibaDictYouDict
1560s, from Pole + land (n.). Related: Polander.
polar (adj.)youdaoicibaDictYouDict
1550s, from Middle French polaire (16c.) or directly from Medieval Latin polaris "of or pertaining to the poles," from Latin polus "an end of an axis" (see pole (n.2)). Meaning "directly opposite in character or tendency" is attested from 1832. Polar bear first recorded 1781.
Polaris (n.)youdaoicibaDictYouDict
1769, short for stella polaris, Modern Latin, literally "the pole star" (see polar). The ancient Greeks called it Phoenice, "the Phoenician (star)," because the Phoenicians used it for navigation, though due to precession of the equinoxes it was not then the pole star. Also see pole (n.2). The Old English word for it was Scip-steorra "ship-star," reflecting its importance in navigation. As the name of a U.S. Navy long-range submarine-launched guided nuclear missile, it dates from 1957.
polarisation (n.)youdaoicibaDictYouDict
chiefly British English spelling of polarization. For spelling, see -ize.
polarity (n.)youdaoicibaDictYouDict
1640s, originally of magnets, from polar + -ity.
polarization (n.)youdaoicibaDictYouDict
1812, from polarize + -ation, and in part from French polarisation, noun of action from polariser. Figuratively from 1871; of social and political groups, "accentuation of differences," from 1945.
polarize (v.)youdaoicibaDictYouDict
1811, in optics, from French polariser, coined by French physicist Étienne-Louis Malus (1775-1812) as a term in optics, from Modern Latin polaris "polar" (see polar). Transferred sense of "to accentuate a division in a group or system" is first recorded 1949 in Arthur Koestler. Related: Polarized; polarizing.
Polaroid (n.)youdaoicibaDictYouDict
material which in thin sheets produces a high degree of plane polarization of light passing through it, 1936, proprietary name (Sheet Polarizer Co., Union City, N.J.). As a type of camera producing prints rapidly, it is attested from 1961.
polder (n.)youdaoicibaDictYouDict
c. 1600, from Dutch polder, from Middle Dutch polre, related to East Frisian poller, polder, of unknown origin.
pole (n.1)youdaoicibaDictYouDict
"stake," late Old English pal "stake, pole, post," a general Germanic borrowing (Old Frisian and Old Saxon pal "stake," Middle Dutch pael, Dutch paal, Old High German pfal, Old Norse pall) from Latin palus "stake" (see pale (n.)).

Racing sense of "inside fence surrounding a course" is from 1851; pole position in auto racing attested from 1904. A ten-foot pole as a metaphoric measure of something one would not touch something (or someone) else with is by 1839, American English. The ten-foot pole was a common tool used to set stakes for fences, etc., and the phrase "Can't touch de bottom with a ten foot pole" is in the popular old minstrel show song "Camptown Races."
"I saw her eat."
"No very unnatural occurrence I should think."
"But she ate an onion!"
"Right my boy, right, never marry a woman who would touch an onion with a ten foot pole."
["The Collegian," University of Virginia, 1839]
pole (n.2)youdaoicibaDictYouDict
"ends of Earth's axis," late 14c., from Old French pole or directly from Latin polus "end of an axis;" also "the sky, the heavens" (a sense sometimes used in English from 16c.), from Greek polos "pivot, axis of a sphere, the sky," from PIE *kwol- "turn round," from root *kwel- (1) "wheel; turn, roll around" (see cycle (n.)).
Pole (n.)youdaoicibaDictYouDict
"inhabitant or native of Poland," 1650s, from German Pole, singular of Polen, from Polish Polanie "Poles," literally "field-dwellers," from pole "field," related to Old Church Slavonic polje "field," from PIE root *pele- (2) "flat, to spread" (see plane (n.1)).
pole (v.)youdaoicibaDictYouDict
"to furnish with poles," 1570s, from pole (n.1). Meaning "to push with a pole" is from 1753. Related: Poled; poling.
pole-star (n.)youdaoicibaDictYouDict
the North Star (see Polaris), 1550s, from pole (n.2) + star (n.).
pole-vault (n.)youdaoicibaDictYouDict
1877, from pole (n.1) + vault (n.2). As a verb from 1892 (implied in pole-vaulting). Related: Pole-vaulted.
poleax (n.)youdaoicibaDictYouDict
kind of axe used as a weapon or by butchers, c. 1300, pollax, from pol "head" (see poll (n.)) + ax (n.). From notion of beheading or head-splitting, or perhaps from the shape of the ax. Spelling altered 17c. by confusion with pole (n.1)).
polecat (n.)youdaoicibaDictYouDict
early 14c., from cat (n.); the first element is perhaps Anglo-French pol, from Old French poule "fowl, hen" (see pullet (n.)); so called because it preys on poultry [Klein]. The other alternative is that the first element is from Old French pulent "stinking," for obvious reasons. Originally the European Putorius foetidus; also applied to related U.S. skunks since 1680s.
polemarch (n.)youdaoicibaDictYouDict
"commander of the army" in Greek history, 1570s, from Greek polemarkhos "one who begins or leads a war," from polemos "war" + arkhos "leader, chief, ruler" (see archon).
polemic (n.)youdaoicibaDictYouDict
1630s, "controversial argument or discussion," from French polémique (16c./17c.), noun use of adjective meaning "disputatious, controversial" (see polemic (adj.)).