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solder [solder 词源字典]: solder: [14] To solder something is etymologically to make it ‘solid’. The word was originally acquired, as a noun, from Old French soldure, a derivative of the verb solder ‘solder’. This in turn came from Latin solidāre ‘make solid, strengthen, fasten’, a derivative of solidus ‘solid’ (source of English solid).
=> soldier, solid[solder etymology, solder origin, 英语词源]
beholder (n.): late 14c., agent noun from behold.
folder (n.): 1550s, "one who folds;" 1903, "folding cover for loose papers" (earlier as "a fold-up document," often a railway timetable or map); agent noun from fold (v.).
freeholder (n.): "one who owns land outright," early 15c.; see freehold.
holder (n.): c. 1400, "tenant, occupier," agent noun from hold (v.). Meaning "device for holding something" is attested from 1833.
molder (v.): also moulder, "to crumble away," 1530s, probably frequentative of mold (n.3) "loose earth." Related: Moldered; moldering.
molder (n.): also moulder, mid-15c., "one who molds or forms," agent noun from mold (v.). From late 13c. as a surname.
penholder (n.): 1815, from pen (n.1) + holder.
place-holder (n.): also placeholder, 1550s, from place (n.) + holder (n.).
polder (n.): c. 1600, from Dutch polder, from Middle Dutch polre, related to East Frisian poller, polder, of unknown origin.
pot-holder (n.): also potholder, the cloth variety so called by 1902, from pot (n.1) + holder.
shareholder (n.): c. 1830, from share (n.1) in the financial sense + agent noun from hold (v.).
smolder (v.): c. 1300 (implied in smoldering), "to smother, suffocate," related to Middle Dutch smolen, Low German smelen, Flemish smoel "hot," from Proto-Germanic *smel-, *smul-. The intransitive meaning "burn and smoke without flame" is first recorded 1520s, fell from use 17c. (though smoldering persisted in poetry) and was revived 19c. Figurative sense "exist in a suppressed state; burn inwardly" is from 1810. Related: Smouldered; smolderingly. Middle English also had a noun smolder meaning "smoky vapor, a stifling smoke."
solder (v.): mid-14c., sawd "mend by soldering," from solder (n.). Modern form is a re-Latinization from early 15c. Related: Soldered; soldering.
solder (n.): early 14c., soudur, from Old French soldure, soudeure, from souder, originally solder, "to consolidate, close, fasten together, join with solder" (13c.), from Latin solidare "to make solid," from solidus "solid" (see solid (adj.)).

Modern form in English is a re-Latinization from early 15c. The loss of Latin -l- in that position on the way to Old French is regular, as poudre from pulverem, cou from collum, chaud from calidus. The -l- typically is sounded in British English but not in American, according to OED, but Fowler wrote that solder without the "l" was "The only pronunciation I have ever heard, except from the half-educated to whom spelling is a final court of appeal ..." and was baffled by the OED's statement that it was American. Related: Soldered; soldering. The noun is first attested late 14c.
stake-holder (n.): 1708, from stake (n.2) + agent noun from hold (v.). Originally one with whom bets are deposited when a wager is made.
stock-holder (n.): 1753, from stock (n.2) + agent noun from hold (v.).
manifolder: "A typeface suitable for manifolding", Early 20th cent.; earliest use found in Funk's Standard Dictionary. From manifold + -er.