Etymology
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darn (v.)

"to mend (fabric) by interweaving yarn or thread to fill a rent or hole," c. 1600, of unknown origin. Perhaps from French darner "mend," from darne "a piece, a slice," from Breton darn "piece, fragment, part." Alternative etymology is from obsolete dern "secret, hidden." Related: Darned; darning.

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fibril (n.)
1680s, Englishing of Modern Latin fibrilla "a little fiber, a filament," especially in botany, diminutive of Latin fibra "a fiber, filament" (see fiber). Latin fibra and fibrilla were used in 17c. physiology in English alongside nativized fibre and fibril. From 1931 as "thread-like molecular formation."
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strand (n.2)
"individual fiber of a rope, string, etc.," late 15c., probably from a continental Germanic source akin to Old High German streno "lock, tress, strand of hair," Middle Dutch strene "a skein, hank of thread," German Strähne "a skein, strand," of unknown connection. Perhaps to English via an Old French form.
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Atropos 
one of the Fates (the one who holds the shears and determines the manner of a person's death and cuts the thread), from Greek, "inflexible, unchangeable," literally "not to be turned away," from a- "not" (see a- (3)) + stem of trepein "to turn" (from PIE root *trep- "to turn"). Related form atropa was the Greek name for deadly nightshade.
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lineament (n.)

early 15c., liniament, "distinctive feature of the body, outline," from Latin lineamentum "contour, outline; a feature," literally "a line, stroke, mark," from lineare "to reduce to a straight line" (here apparently in an unrecorded sense "trace lines"), from linea "string, thread, line" (see line (n.)). Figurative sense of "a characteristic" is attested from 1630s.

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reel (n.1)

"cylinder or frame turning on an axis," especially one on which thread, yarn, string, etc. is wound after being spun, Middle English rele, from late Old English reol, hreol "reel for winding thread," from Proto-Germanic *hrehulaz; probably related to hrægel "garment," and Old Norse hræll "spindle" (from PIE *krek- "to weave, beat;" source also of Greek krokus "nap of cloth").

Specifically of the fishing rod attachment from 1726. Of a film projector apparatus from 1896, hence in movie jargon "a length of film wound on one reel" as a part of a whole motion picture. With a number (two-reeler, typical of snort comedy, etc.) indicating film length (by 1916). Reel-to-reel as a type of tape deck is attested from 1958.

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spool (n.)

early 14c., "wheel for winding thread upon," from Old North French spole, espole "a spool" (13c.), from Middle Dutch spoele "a spool," from Proto-Germanic *spolon (source also of Norwegian and Swedish spole, Old High German spuola, German Spule "a spool, bobbin"), from PIE root *spel- (1) "to cleave, split" (see spoil (v.)).

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burl (n.)
mid-15c., "small knot in cloth or thread," from Old French bourle "tuft of wool," which perhaps is related to the root of bur, or from Vulgar Latin *burrula "small flock of wool," from Late Latin burra "wool," a word of unknown origin. In American English also "a knot or excrescence on a walnut or other tree" (1868).
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pointing (n.)

late 14c., "the act of replacing or filling up the mortar in the exterior faces of joints in stone- or brickwork," verbal noun from point (v.). Also from late 14c. as "pricking;" the sense of "process of attaching pieces of thread lace as a fringe or border" is from mid-15c. Meaning "action of indicating or directing with the finger, etc." is from 1550s.

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lineage (n.)
late 17c., from Middle English linage "line of descent; an ancestor" (c. 1300), from Old French lignage "descent, extraction, race" (11c.), from ligne "line," from Latin linea "line of descent," literally "string, line, thread" (see line (n.)). The word altered in spelling and pronunciation in early Modern English, apparently by some combined influence of line (n.) and lineal.
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