英语词源字典 - 在线词源网站

file [file 词源字典]: file: The file for smoothing and rubbing [OE] and the file for storing things in [16] are quite different words. The former comes from a prehistoric Germanic *fikhalā (source also of German feile and Dutch vijl), which goes back ultimately to Indo-European *pik-, *peik-, denoting ‘cut’. The latter, on the other hand, comes from Old French fil, a descendant of Latin filum ‘thread’, which was applied to a piece of string or wire suspended from two points and used for hanging documents and records on for easy reference.

As methods of document storage and retrieval became more sophisticated, the word file followed them. The later file ‘(military) column’, first recorded at the end of the 16th century, probably represents a reborrowing from French, but it is ultimately the same word. Fillet [14] originated as a diminutive form of Latin filum.
=> filigree, fillet[file etymology, file origin, 英语词源]
plane: plane: English has five distinct planes, four of which are essentially the same word as plain. These come ultimately from Latin plānus, but preserve its ‘flat’ meanings rather than (like plain) its ‘clear’ meanings. Plane ‘flat surface’ [17] comes from Latin plānum, a noun use of the neuter form of the adjective; it is the plane from which aeroplane, and hence its abbreviation plane, were formed. Plane ‘carpenter’s smoothing tool’ [14] comes via Old French plane from late Latin plāna, a derivative of the verb plānāre ‘make level’, itself a derivative of plānus. Plane ‘flat’ [17] is an alteration of plain, on the model of French plan ‘flat’.

And plane ‘glide, soar’ [17] comes from French planer, a derivative of plan ‘level surface’ (the underlying notion being of a bird soaring with level wings). The odd man out is plane the tree-name [14], which comes via Old French plane and Latin platanus from Greek plátanos, a derivative of platús ‘broad’ (source of English place, plaice, and platypus) – the reference being to its broad leaves. Platanus probably also underlies English plantain, as applied to the banana-like vegetable.
=> piano, plain; place, plaice, plantain, plate, platypus
file (n.2): metal tool for abrading or smoothing, Old English feol (Mercian fil) "file," from Proto-Germanic *fihalo "cutting tool" (cognates: Old Saxon fila, Old High German fila, Middle Dutch vile, Dutch vijl, German Feile), probably from PIE *peig- (1) "to cut, mark by incision" (cognates: Old Church Slavonic pila "file, saw," Lithuanian pela "file;" see paint (v.)). Century Dictionary (1906) lists 60 named varieties of them.
flat-iron (n.): "iron for smoothing," 1810, from flat (adj.) + iron (n.). Applied to triangular or wedge-shaped buildings from 1862.
ironing (n.): "act of pressing and smoothing clothes with a heated flat-iron," c. 1710, from present participle of iron (v.). Ironing board attested from 1843.
plane (n.3): "tool for smoothing surfaces," mid-14c., from Old French plane, earlier plaine (14c.), from Late Latin plana, back-formation from planare "make level," from Latin planus "level, flat" (see plane (n.1)).
slicker (n.): 1851, "tool for smoothing leather," from slick (v.). Meaning "waterproof raincoat" is from 1884; sense of "clever and crafty person" is from 1900.
smooth (v.): late Old English smoþ "to make smooth," replacing smeðan "to smooth, soften, polish; appease, soothe;" smeðian "smoothen, become smooth," from the source of smooth (adj.). Meaning "to make smooth" is c. 1200. Related: Smoothed; smoothing. Middle English also had a verb form smoothen (mid-14c.).