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kindred (n.)

c. 1200, perhaps late Old English, kinraden, "family, lineage; race, nation, tribe, people; kinsfolk, blood relations," compound of kin (q.v.) + -rede (see -red). With unetymological first -d- (17c.) probably for phonetic reasons (see D) but perhaps encouraged by kind (n.). As an adjective, 1520s, from the noun.

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congenial (adj.)

1620s, "kindred, partaking of the same nature or natural characteristics," from assimilated form of Latin com "with, together" (see con-) + genialis "of birth," thus, "kindred" (from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups). Sense of "agreeable" is first recorded 1711 on the notion of "having natural affinity." Also compare congenital.

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*re- 

*rē-, Proto-Indo-European root meaning "to reason, count;" a variant of PIE root *ar-, also arə-, "to fit together." 

It forms all or part of: Alfred; arraign; arithmetic; Conrad; dread; Eldred; Ethelred; hatred; hundred; kindred; logarithm; Ralph; rate (n.) "estimated value or worth;" rathskeller; ratify; ratio; ration; read; reason; rede; rhyme; riddle (n.1) "word-game;" rite; ritual.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit radh- "to succeed, accomplish;" Greek arithmos "number, amount;" Latin reri "to consider, confirm, ratify," ritus "rite, religious custom;" Old Church Slavonic raditi "to take thought, attend to;" Old Irish im-radim "to deliberate, consider;" Old English rædan "to advise, counsel, persuade; read;" Old English, Old High German rim "number;" Old Irish rim "number," dorimu "I count."

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brotherhood (n.)

14c., "fraternal relation, relationship between sons of the same father or mother," from brother + -hood; earlier was brotherhede (c. 1300), with ending as in maidenhead; and Old English had broþerrede, with ending as in kindred. The modern form of the word prevailed from 15c.

Originally "relationship of a brother," also "friendly companionship." The concrete sense of "an association of men for any purpose, a fraternity" is from mid-14c. in the Middle English word (later also "labor union," 1880s). The meaning "a class of individuals of the same kind" is from 1728. The meaning "community feeling uniting all humankind" is from 1784. Old English also had broðorscipe "brothership," broðorsibb "kinship of brothers."

What edge of subtlety canst thou suppose
Keen enough, wise and skilful as thou art,
To cut the link of brotherhood, by which
One common Maker bound me to the kind?
[Cowper, from "The Task," 1785]

***

Oh, the Protestants hate the Catholics,
And the Catholics hate the Protestants,
And the Hindus hate the Muslims,
And everybody hates the Jews.
[Tom Lehrer, "National Brotherhood Week" lyrics, 1965]
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D 

fourth letter of the Roman alphabet, from Greek delta, from Phoenician and Hebrew daleth, pausal form of deleth "door," so called from its shape.

The form of the modern letter is the Greek delta (Δ) with one angle rounded. As the sign for "500" in Roman numerals, it is said to be half of CIƆ, which was an early form of M, the sign for "1,000." 3-D for "three-dimensional" is attested from 1952.

Unetymological -d- is the result of a tendency in English and neighboring languages, perhaps for euphony, to add -d- to -n-, and especially to insert or swap a -d- sound when -l- or -r- follow too closely an -n-.

Compare sound (n.1), gender (n.), thunder (n.), spindle, kindred, strand (n.2) "fiber of rope," dialectal rundel, rundle for runnel. Swound was a form of swoun (swoon) attested from mid-15c, and used by Malory, Spenser, Lyly, Middleton, Beaumont & Fletcher. Among the words from French are powder (n.), meddle, tender (adj.), remainder, also riband, jaundice. It is less evident in spider (an agent noun from the Germanic *spin- root), and perhaps explains lender in place of loaner.

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spindle (n.)

"small tapering bar hung from the end of the thread as it is drawn from the fiber on the distaff," early 13c., spindel, with unetymological -d-, from Old English spinel "small wooden bar used in hand-spinning," properly "an instrument for spinning," from stem of spinnan (see spin (v.)) + instrumental suffix -el (1) as in handle, treadle, thimble, etc.

It is cognate with Old Saxon spinnila, Old Frisian spindel, Old High German spinnila, German Spindel. The -d- perhaps is by influence of windel "wooden reel for winding yarn" (early 14c., itself perhaps from a derivative of Old Norse vindla "to wind up" or Middle Dutch windelen). But it also might be a euphonic insertion, as in kindred, tender, etc., for which process see D.

Transferred to the pin in spinning-wheels, then late 18c. to machine parts. It is attested from early 14c. as "axle of any revolving tool or instrument." As a quantity or measure of yarn ("amount collected on a spindle"), mid-15c. As a type of something slender, it is attested from 1570s, especially of legs. As with distaff, sometimes formerly used as a metonym for "the female sex," as in Old English spinelhealf "female line of descent," distinguished from sperehealf "male line of descent."


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*gene- 

*genə-, also *gen-, Proto-Indo-European root meaning "give birth, beget," with derivatives referring to procreation and familial and tribal groups.

It forms all or part of: Antigone; autogenous; benign; cognate; congener; congenial; congenital; connate; cosmogony; cryogenic; degenerate; engender; engine; epigone; eugenics; -gen; gendarme; gender; gene; genealogy; general; generate; generation; generic; generous; genesis; -genesis; genial; -genic; genital; genitive; genius; genocide; genotype; genre; gens; gent; genteel; gentile; gentle; gentry; genuine; genus; -geny; germ; german (adj.) "of the same parents or grandparents;" germane; germinal; germinate; germination; gingerly; gonad; gono-; gonorrhea; heterogeneous; homogeneous; homogenize; homogenous; impregnate; indigenous; ingenious; ingenuous; innate; jaunty; kermes; kin; kindergarten; kindred; king; kind (n.) "class, sort, variety;" kind (adj.) "friendly, deliberately doing good to others;" Kriss Kringle; malign; miscegenation; nada; naive; nascent; natal; Natalie; nation; native; nature; nee; neonate; Noel; oncogene; ontogeny; photogenic; phylogeny; pregnant (adj.1) "with child;" primogenitor; primogeniture; progenitor; progeny; puisne; puny; renaissance; theogony; wunderkind.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit janati "begets, bears," janah "offspring, child, person," janman- "birth, origin," jatah "born;" Avestan zizanenti "they bear;" Greek gignesthai "to become, happen," genos "race, kind," gonos "birth, offspring, stock;" Latin gignere "to beget," gnasci "to be born," genus (genitive generis) "race, stock, kind; family, birth, descent, origin," genius "procreative divinity, inborn tutelary spirit, innate quality," ingenium "inborn character," possibly germen "shoot, bud, embryo, germ;" Lithuanian gentis "kinsmen;" Gothic kuni "race;" Old English cennan "beget, create," gecynd "kind, nature, race;" Old High German kind "child;" Old Irish ro-genar "I was born;" Welsh geni "to be born;" Armenian cnanim "I bear, I am born."

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Cymric (adj.)

"of or pertaining to the Welsh" and their kindred, the Cornish and Bretons, by 1833, from Welsh Cymru "Wales," Cymry "the Welsh," plural of Cymro, probably from ancient combrox "compatriot," from British Celtic *kom-brogos, from collective prefix *kom- (see com-) + *brogos "district," from PIE root *merg- "boundary, border." Compare Allobroges, name of a warlike people in Gallia Narbonensis, literally "those from another land." As from 1833 as a noun, "the language of the Cymry."

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resentment (n.)

"deep sense of injury, the excitement of passion which proceeds from a sense of wrong offered to one's self or one's kindred or friends," especially when directed at the author of the affront, 1610s, from French ressentiment (16c.), verbal noun from ressentir (see resent). Slightly earlier in English in the French form resentiment (1590s); also compare ressentiment.

"Ridicule often parries resentment, but resentment never yet parried ridicule." [Walter Savage Landor, "Imaginary Conversations"]
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congeniality (n.)

1610s, "state of being kindred; affinity of character or interests;" as if from Latin but apparently a modern formation; compare congenial + -ity.

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