Etymology
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*g(a)lag- 

also *g(a)lakt-, Proto-Indo-European root meaning "milk."

It forms all or part of: ablactation; cafe au lait; galactic; galaxy; lactate (v.); lactate (n.); lactation; lacteal; lactescence; lactic; lactivorous; lacto-; lactose; latte; lettuce.

It is the hypothetical source of/evidence for its existence is provided by: Latin lac (genitive lactis) "milk;" Greek gala (genitive galaktos), "milk;" Armenian dialectal kaxc' "milk." The initial "g" probably was lost in Latin by dissimilation. This and the separate root *melg-, account for words for "milk" in most of the Indo-European languages. The absence of a common word for it is considered a mystery.

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cannibalise (v.)

chiefly British English spelling of cannibalize (q.v.); for suffix, see -ize. Related: Cannibalised; cannibalising; cannibalisation.

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*em- 

Proto-Indo-European root meaning "to take, distribute." 

It forms all or part of: assume; consume; emption; example; exemplar; exemplary; exemplify; exempt; exemption; impromptu; peremptory; pre-emption; premium; presume; presumption; prompt; pronto; ransom; redeem; redemption; resume; sample; sejm; subsume; sumptuary; sumptuous; vintage.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit yamati "holds, subdues;" Latin emere "buy," originally "take," sumere "to take, obtain, buy;" Old Church Slavonic imo "to take;" Lithuanian imu, imti "to take."

For the sense shift from "take" to "buy" in the Latin verbs, compare Old English sellan "to give," source of Modern English sell "to give in exchange for money;" Hebrew laqah "he bought," originally "he took;" and colloquial English I'll take it for "I'll buy it." 

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*pel- (4)

Proto-Indo-European root meaning "to sell." 

It forms all or part of: bibliopole; monopolize; monopoly; oligopolistic; oligopoly.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit panate "barters, purchases;" Lithuanian pelnas "gain;" Greek pōlein "to sell;" Old Church Slavonic splenu, Russian polon "prey, booty;" Old Norse falr, Dutch veil, German feil "for sale, venal."  

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*wer- (3)

Proto-Indo-European root meaning "perceive, watch out for."

It forms all or part of: Arcturus; avant-garde; award; aware; beware; Edward; ephor; garderobe; guard; hardware; irreverence; lord; panorama; pylorus; rearward; regard; revere; reverence; reverend; reward; software; steward; vanguard; ward; warden; warder; wardrobe; ware (n.) "manufactured goods, goods for sale;" ware (v.) "to take heed of, beware;" warehouse; wary.

It is the hypothetical source of/evidence for its existence is provided by: Latin vereri "to observe with awe, revere, respect, fear;" Greek ouros "a guard, watchman," horan "to see;" Hittite werite- "to see;" Old English weard "a guarding, protection; watchman, sentry, keeper."

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*ned- 

Proto-Indo-European root meaning "to bind, tie."

It forms all or part of: annex; annexation; connect; connection; denouement; net (n.) "netting, network, mesh used for capturing;" nettle; nexus; node; nodule; noose.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nahyati "binds, ties;" Latin nodus "knot;" Old Irish nascim "I bind, oblige;" Old English net "netting, network."

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*stegh- 

Proto-Indo-European root meaning "to stick, prick, sting." It forms all or part of: stag; sting; stochastic.

It is the hypothetical source of/evidence for its existence is provided by: Greek stokhos "fixed target, erected pillar for archers to shoot at;" Lithuanian stagaras "long, thin stalk of a plant;" Old English stagga "stag," stingan "to sting;" Old Danish stag "point;" Old Norse stong "stick, pole."

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*bhergh- (1)

Proto-Indo-European root meaning "to hide, protect." It forms all or part of: bargain; borrow; burial; bury; harbor; hauberk; scabbard.

It is the hypothetical source of/evidence for its existence is provided by: Old English Old English borgian "to lend, be surety for;" Old Church Slavonic brěgo "I preserve, guard," Lithuanian bìrginti "be parsimonious." But, absent other possible cognates, Boutkan writes that it is not certainly Indo-European and "probably a substratum word."

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*dlegh- 

Proto-Indo-European root found in Celtic, Germanic, Slavic, and possibly Latin, meaning "to engage oneself, be or become fixed."

It forms all or part of: indulge; indulgence; play; pledge; plight (v.) "to pledge;" replevin.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit drmha-, drhya- "to fix, make firm;" Old Avestan derez- "fetter;" Gaulish delgu "to hold," Middle Welsh dala "to hold," Old Breton delgim "to hold;" Old Saxon plegan "vouch for," Gothic tulgjan "to fasten."

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*uper 

Proto-Indo-European root meaning "over."

It forms all or part of: hyper-; insuperable; over; over-; sirloin; somersault; soprano; soubrette; sovereign; sum; summit; super-; superable; superb; superior; supernal; supra-; supreme; sur-.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit upari, Avestan upairi "over, above, beyond;" Greek hyper, Latin super "above, over;" Old English ofer "over," German über, Gothic ufaro "over, across;" Gaulish ver-, Old Irish for.

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