bar (n.1)youdaoicibaDictYouDict[bar 词源字典]
late 12c., "stake or rod of iron used to fasten a door or gate," from Old French barre (12c.) "beam, bar, gate, barrier," from Vulgar Latin *barra "bar, barrier," which some suggest is from Gaulish *barros "the bushy end" [Gamillscheg], but OED regards this as "discredited" because it "in no way suits the sense." Of soap, by 1833; of candy, by 1906 (the process itself dates to the 1840s). Meaning "bank of sand across a harbor or river mouth" is from 1580s, probably so called because it was an obstruction to navigation. Bar graph is attested from 1925. Bar code first recorded 1963. Behind bars "in prison" is attested by 1934, U.S.[bar etymology, bar origin, 英语词源]
delta (n.)youdaoicibaDictYouDict
c. 1200, Greek letter shaped like a triangle, equivalent to our "D," the name from Phoenician daleth "tent door." Herodotus used it of the mouth of the Nile, and it was so used in English from 1550s; applied to other river mouths from 1790.
embouchure (n.)youdaoicibaDictYouDict
1760, in musical sense "placement of the mouth on a wind instrument," from French embouchure "river mouth, mouth of a wind instrument," from assimilated form of en- "in" (see en- (1)) + bouche "mouth" (see bouche).
OsloyoudaoicibaDictYouDict
Norwegian capital, probably based on Old Norse os "estuary, river mouth," based on the place's situation.
outlet (n.)youdaoicibaDictYouDict
mid-13c., "a river mouth," from out + let (v.). Electrical wiring sense is attested from 1892. Meaning "a retail store" is attested from 1933. Figurative sense "means of relief or discharge" is from 1620s.
ria (n.)youdaoicibaDictYouDict
from Spanish ria "estuary, river mouth" (adopted as a geological term first in German, 1886), from Latin ripa "stream bank" (see riparian).