urchinyoudaoicibaDictYouDict[urchin 词源字典]
urchin: [13] Urchin originally meant ‘hedgehog’. It was borrowed from Old Northern French herichon, which came via Vulgar Latin *hēriciō from Latin hērīcius or ērīcius ‘hedgehog’, a derivative of ēr ‘hedgehog’. This ancestral sense now survives only dialectally, but its spiny connotations are preserved in sea urchin, which dates from the late 16th century. The metaphorical ‘dirty scruffy child, brat’ emerged in the 16th century too. The second syllable of caprice goes back to Latin ērīcius.
=> caprice[urchin etymology, urchin origin, 英语词源]
echinoderm (n.)youdaoicibaDictYouDict
1834, from Modern Latin Echinodermata, name of the phylum that includes starfish and sea urchins, from Latinized form of Greek ekhinos "sea urchin," originally "porcupine, hedgehog" (see echidna) + derma (genitive dermatos) "skin" (see derma); so called from its spiky shell. Related: Echinodermal.
fairy (n.)youdaoicibaDictYouDict
c. 1300, fairie, "the country or home of supernatural or legendary creatures; fairyland," also "something incredible or fictitious," from Old French faerie "land of fairies, meeting of fairies; enchantment, magic, witchcraft, sorcery" (12c.), from fae "fay," from Latin fata "the Fates," plural of fatum "that which is ordained; destiny, fate," from PIE *bha- "to speak" (see fame (n.)). Also compare fate (n.), also fay.
In ordinary use an elf differs from a fairy only in generally seeming young, and being more often mischievous. [Century Dictionary]
But that was before Tolkien. As a type of supernatural being from late 14c. [contra Tolkien; for example "This maketh that ther been no fairyes" in "Wife of Bath's Tale"], perhaps via intermediate forms such as fairie knight "supernatural or legendary knight" (c. 1300), as in Spenser, where faeries are heroic and human-sized. As a name for the diminutive winged beings in children's stories from early 17c.
Yet I suspect that this flower-and-butterfly minuteness was also a product of "rationalization," which transformed the glamour of Elfland into mere finesse, and invisibility into a fragility that could hide in a cowslip or shrink behind a blade of grass. It seems to become fashionable soon after the great voyages had begun to make the world seem too narrow to hold both men and elves; when the magic land of Hy Breasail in the West had become the mere Brazils, the land of red-dye-wood. [J.R.R. Tolkien, "On Fairy-Stories," 1947]
Hence, figurative adjective use in reference to lightness, fineness, delicacy. Slang meaning "effeminate male homosexual" is recorded by 1895. Fairy ring, of certain fungi in grass fields (as we would explain it now), is from 1590s. Fairy godmother attested from 1820. Fossil Cretaceous sea urchins found on the English downlands were called fairy loaves, and a book from 1787 reports that "country people" in England called the stones of the old Roman roads fairy pavements.
pentagon (n.)youdaoicibaDictYouDict
plane figure with five angles and five sides, 1560s, from Middle French pentagone or directly from Late Latin pentagonum "pentagon," from Greek pentagonon, noun use of neuter of adjective pentagonos "five-angled," from pente "five" (see five) + gonia "angle" (see -gon). The U.S. military headquarters Pentagon was completed 1942, so called for its shape; used allusively for "U.S. military leadership" from 1945. Related: Pentagonal.
In nature, pentagonal symmetry is rare in inanimate forms. Packed soap bubbles seem to strive for it but never quite succeed, and there are no mineral crystals with true pentagonal structures. But pentagonal geometry is basic to many living things, from roses and forget-me-nots to sea urchins and starfish. [Robert Bringhurst, "The Elements of Typographic Style," 1992]
pileated (adj.)youdaoicibaDictYouDict
1728, from Latin pileatus "capped," from pileus "felt cap without a brim," from Greek pilos. Applied in natural history to certain birds and sea urchins.
sea (n.)youdaoicibaDictYouDict
Old English "sheet of water, sea, lake, pool," from Proto-Germanic *saiwaz (cognates: Old Saxon seo, Old Frisian se, Middle Dutch see, Swedish sjö), of unknown origin, outside connections "wholly doubtful" [Buck]. Meaning "large quantity" (of anything) is from c. 1200. Meaning "dark area of the moon's surface" is attested from 1660s (see mare (n.2)).

Germanic languages also use the general Indo-European word (represented by English mere (n.)), but have no firm distinction between "sea" and "lake," either by size, by inland or open, or by salt vs. fresh. This may reflect the Baltic geography where the languages are thought to have originated. The two words are used more or less interchangeably in Germanic, and exist in opposite senses (such as Gothic saiws "lake," marei "sea;" but Dutch zee "sea," meer "lake"). Compare also Old Norse sær "sea," but Danish , usually "lake" but "sea" in phrases. German See is "sea" (fem.) or "lake" (masc.). The single Old English word glosses Latin mare, aequor, pontus, pelagus, and marmor.

Phrase sea change "transformation" is attested from 1610, first in Shakespeare ("The Tempest," I.ii). Sea anemone is from 1742; sea legs is from 1712; sea level from 1806; sea urchin from 1590s. At sea in the figurative sense of "perplexed" is attested from 1768, from literal sense of "out of sight of land" (c. 1300).
urchin (n.)youdaoicibaDictYouDict
c. 1300, yrichon "hedgehog," from Old North French *irechon (cognates: Picard irechon, Walloon ireson, Hainaut hirchon), from Old French herichun "hedgehog" (Modern French hérisson), formed with diminutive suffix -on + Vulgar Latin *hericionem, from Latin ericius "hedgehog," enlarged form of er, originally *her, from PIE root *ghers- "to bristle" (cognates: Greek kheros "hedgehog;" see horror).

Still used for "hedgehog" in non-standard speech in Cumbria, Yorkshire, Shropshire. Applied throughout 16c. to people whose appearance or behavior suggested hedgehogs, from hunchbacks (1520s) to goblins (1580s) to bad girls (1530s); meaning "poorly or raggedly clothed youngster" emerged 1550s, but was not in frequent use until after c. 1780. Sea urchin is recorded from 1590s (a 19c. Newfoundland name for them was whore's eggs); Johnson describes it as "a kind of crabfish that has prickles instead of feet."