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frank [frank 词源字典]: frank: [13] To call someone frank is to link them with the Germanic people who conquered Gaul around 500 AD, the Franks, who gave their name to modern France and the French. After the conquest, full political freedom was granted only to ethnic Franks or to those of the subjugated Celts who were specifically brought under their protection. Hence, franc came to be used as an adjective meaning ‘free’ – a sense it retained when English acquired it from Old French: ‘He was frank and free born in a free city’, John Tiptoft, Julius Caesar’s commentaries 1470.

In both French and English, however, it gradually progressed semantically via ‘liberal, generous’ and ‘open’ to ‘candid’. Of related words in English, frankincense [14] comes from Old French franc encens, literally ‘superior incense’ (‘superior’ being a now obsolete sense of French franc), and franc [14], the French unit of currency, comes from the Latin phrase Francorum rex ‘king of the Franks’, which appeared on the coins minted during the reign of Jean le Bon (1350–64).

The Franks, incidentally, supposedly got their name from their preferred weapon, the throwing spear, in Old English franca.
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guinea: guinea: [17] Guinea first emerged as the name of a section of the West Africa continent in the late 16th century (its origins are not known, but presumably it was based on an African word). In 1663 the Royal Mint began to produce a gold coin valued at 20 shillings ‘for the use of the Company of Royal Adventurers of England trading with Africa’. It had the figure of an elephant on it.

Straightaway it became known as a guinea, both because its use was connected with the Guinea coast and because it was made from gold obtained there. And what is more, the coins soon came to be much in demand for domestic use: on 29 October 1666 Samuel Pepys recorded ‘And so to my goldsmith to bid him look out for some gold for me; and he tells me that Ginnys, which I bought 2000 of not long ago, and cost me but 18½d. change, will now cost me 22d., and but very few to be had at any price.

However, some more I will have, for they are very convenient – and of easy disposal’. Its value fluctuated, and was not fixed at 21 shillings until 1717. The last one was minted in 1813, but guinea as a term for the amount 21 shillings stayed in use until the early 1970s, when the decimalization of British currency dealt it the deathblow. The guinea pig [17], incidentally, comes from South America, and its name probably arose from a confusion between Guinea and Guiana, on the northern coast of South America.
sequin: sequin: [17] When English first adopted sequin, it was the name of a coin. Its ultimate ancestor was Arabic sikkah, which denoted a die from which coins were minted (in Anglo-Indian English from the 17th to the 19th century, a sicca was a newly minted rupee). Italian took the word over as zecca, and created a diminutive form zecchino, referring to a gold coin.

The original application was specifically to a Venetian coin, but this subsequently broadened out, and the term was also used for a Turkish coin (alternatively known as a sultanin). In French, zecchino became sequin, which is the form in which English acquired it. The word might well have followed the coin into oblivion, but in the late 19th century it managed to get itself applied to the small round shiny pieces of metal applied to clothing, and its continued existence was guaranteed.
dollar (n.): 1550s, from Low German daler, from German taler (1530s, later thaler), abbreviation of Joachimstaler, literally "(gulden) of Joachimstal," coin minted 1519 from silver from mine opened 1516 near Joachimstal, town in Erzgebirge Mountains in northwest Bohemia. German Tal is cognate with English dale.

The thaler was a large silver coin of varying value in the German states (and a unit of the German monetary union of 1857-73 equal to three marks); it also served as a currency unit in Denmark and Sweden. English colonists in America used the word in reference to Spanish pieces of eight. Due to extensive trade with the Spanish Indies and the proximity of Spanish colonies along the Gulf Coast, the Spanish dollar was probably the coin most familiar in the American colonies and the closest thing to a standard in all of them; it was used in the government's records of public debt and expenditures; it had the added advantage of not being British. The Continental Congress in 1786 adopted dollar as a unit when it set up the modern U.S. currency system, which was based on the suggestion of Gouverneur Morris (1782) as modified by Thomas Jefferson. None were circulated until 1794 .
When William M. Evarts was Secretary of State he accompanied Lord Coleridge on an excursion to Mount Vernon. Coleridge remarked that he had heard it said that Washington, standing on the lawn, could throw a dollar clear across the Potomac. Mr. Evarts explained that a dollar would go further in those days than now. [Walsh]
Phrase dollars to doughnuts attested from 1890; dollar diplomacy is from 1910. The dollar sign ($) is said to derive from the image of the Pillars of Hercules, stamped with a scroll, on the Spanish piece of eight. However, according to the Bureau of Engraving and Printing of the U.S. Department of the Treasury:
[T]he most widely accepted explanation is that the symbol is the result of evolution, independently in different places, of the Mexican or Spanish "P's" for pesos, or piastres, or pieces of eight. The theory, derived from a study of old manuscripts, is that the "S" gradually came to be written over the "P," developing a close equivalent of the "$" mark. It was widely used before the adoption of the United States dollar in 1785.
eagle (n.): mid-14c., from Old French egle, from Old Provençal aigla, from Latin aquila "black eagle," fem. of aquilus, often explained as "dark colored" (bird); see aquiline. The native term was erne. Golf score sense is by 1908 (according to old golf sources, because it "soars higher" than a birdie). As the name of a U.S. $10 coin minted from 1792 to 1933, established in the 1786 resolution for a new monetary system (but at first only the desperately needed small copper coins were minted). The figurative eagle-eyed is attested from c. 1600.
farthing (n.): Old English feorðing (Old Northumbrian feorðung) "quarter of a penny; a fourth part," a diminutive derivative of feorða "fourth" (from feower "four;" see four) + -ing "fractional part." Cognate with Old Frisian fiardeng, Middle Low German verdink, Old Norse fjorðungr, Old Danish fjerdung "a fourth part of anything."

In late Old English also a division of land, probably originally a quarter of a hide. The modern English coin first was minted under Edward I and abolished 1961. The word was used in biblical translations for Latin quadrans "quarter of a denarius."
I shall geat a fart of a dead man as soone As a farthyng of him. [Heywood, "Proverbs," 1562]
guinea (n.): former British coin, 1660s, from Guinea, because the coins were first minted for British trade with Guinea (but soon in domestic use) and with gold from Africa. The original guinea was in use from 1663 to 1813.
half-cent (n.): U.S. copper coin minted from 1793 to 1857, established and named in the 1786 resolution for a new monetary system; see half + cent.
half-dime (n.): U.S. silver coin minted from 1792 to 1873; originally half-disme; later form by 1800; from half + dime.
half-eagle (n.): U.S. $5 gold coin minted from 1795 to 1929, authorized in the 1786 resolution for a new monetary system; see half + eagle in the coinage sense.
mint (v.): "to stamp metal to make coins," 1540s, from mint (n.2). Related: Minted; minting. Minter "one who stamps coins to create money" is from early 12c.
mint (adj.): "perfect" (like a freshly minted coin), 1887 (in mint condition), from mint (n.2).