Etymology
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*sol- 

also solə-, Proto-Indo-European root meaning "whole, well-kept." 

It forms all or part of: catholic; consolidate; consolidation; holism; holo-; holocaust; Holocene; hologram; holograph; insouciant; safe; safety; sage (n.1) kind of herb; salubrious; salutary; salute; salvage; salvific; salvo "simultaneous discharge of guns;" save (v.) "deliver from danger;" save (prep.) "except;" solder; soldier; solemn; solicit; solicitous; solid; solidarity; solidity; sou.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sarvah "uninjured, intact, whole;" Avestan haurva- "uninjured, intact;" Old Persian haruva-; Greek holos "whole;" Latin salvus "uninjured, in good health, safe," salus "good health," solidus "solid;" Armenian olj "whole, healthy."  

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*skeud- 
Proto-Indo-European root meaning "to shoot, chase, throw."

It forms all or part of: scot-free; scout (v.2) "to reject with scorn;" sheet (n.1) "cloth, covering;" sheet (n.2) "rope that controls a sail;" shoot; shot; shout; shut; shuttle; skeet; wainscot.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit skundate "hastens, makes haste;" Old Church Slavonic iskydati "to throw out;" Lithuanian skudrus "quick, nimble;" Old English sceotan "to hurl missiles," Old Norse skjota "to shoot with (a weapon)."
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*tag- 
Proto-Indo-European root meaning "to touch, handle," with figurative extensions ("border on; taste, partake of; strike, hit; affect, impress; trick, cheat; mention, speak of").

It forms all or part of: attain; contact; contaminate; entire; intact; integer; integrate; integrity; noli me tangere; tact; tactics; tactile; tangent; tangible; task; taste; tax; taxis.

It is the hypothetical source of/evidence for its existence is provided by: Latin tangere "to touch," taxare "to touch, assess," tactus "touch," integer "intact, whole, complete, perfect; honest;" Greek tassein "to arrange," tetagon "having seized;" Old English þaccian "stroke, strike gently."
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*plek- 
Proto-Indo-European root meaning "to plait." It is an extended form of root *pel- (2) "to fold."

It forms all or part of: accomplice; application; apply; complex; complexion; complicate; complication; complicity; deploy; display; duplex; duplicate; duplicity; employ; explicate; explicit; exploit; flax; implex; implicate; implication; implicit; imply; multiply; perplex; perplexity; plait; plash (v.2) "to interlace;" pleat; -plex; plexus; pliable; pliant; plie; plight (n.1) "condition or state;" ply (v.1) "work with, use;" ply (v.2) "to bend; ply (n.) "a layer, fold;" replica; replicate; replication; reply; simplex; splay; triplicate.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit prasna- "turban;" Greek plekein "to plait, braid, wind, twine," plektos "twisted;" Latin plicare "to lay, fold, twist," plectere (past participle plexus) "to plait, braid, intertwine;" Old Church Slavonic plesti "to braid, plait, twist," Russian plesti; Gothic flahta "braid;" Old Norse fletta, Old High German flehtan "to plait;" Old English fleax "cloth made with flax, linen."
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*kleu- 

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

It forms all or part of: ablaut; Cleon; Clio; Damocles; Hercules; leer; list (v.2) "hear, harken;" listen; loud; Mstislav; Pericles; Slav; slave; Slavic; Slovene; Sophocles; Themistocles; umlaut; Wenceslas; Yugoslav.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit srnoti "hears," srosati "hears, obeys," srutah "heard of, celebrated;" Avestan sraothra "ear;" Middle Persian srod "hearing, sound;" Greek klyo "hear, be called," klytos "heard of, celebrated," kleos "report, rumor, fame glory," kleio "make famous;" Latin cluere "to hear oneself called, be spoken of," inclutus "renowned, famous;" Armenian lu "known;" Lithuanian klausau, klausyti "to hear," šlovė "splendor, honor;" Old Church Slavonic slusati "to hear," slava "fame, glory," slovo "word;" Old Irish ro-clui-nethar "hears," clunim "I hear," clu "fame, glory," cluada "ears," Irish cloth "noble, brave;" Welsh clywaf "I hear," clod "praise, fame;" Old English hlud "loud," hlysnan "to listen, hear," hleoðor "tone, tune;" Old High German hlut "sound;" Gothic hiluþ "listening, attention."

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*bhel- (2)
Proto-Indo-European root meaning "to blow, swell," "with derivatives referring to various round objects and to the notion of tumescent masculinity" [Watkins].

It forms all or part of: bale (n.) "large bundle or package of merchandise prepared for transportation;" baleen; ball (n.1) "round object, compact spherical body;" balloon; ballot; bawd; bold; bole; boll; bollocks; bollix; boulder; boulevard; bowl (n.) "round pot or cup;" bulk; bull (n.1) "bovine male animal;" bullock; bulwark; follicle; folly; fool; foosball; full (v.) "to tread or beat cloth to cleanse or thicken it;" ithyphallic; pall-mall; phallus.

It is the hypothetical source of/evidence for its existence is provided by: Greek phyllon "leaf," phallos "swollen penis;" Latin flos "flower," florere "to blossom, flourish," folium "leaf;" Old Prussian balsinis "cushion;" Old Norse belgr "bag, bellows;" Old English bolla "pot, cup, bowl;" Old Irish bolgaim "I swell," blath "blossom, flower," bolach "pimple," bolg "bag;" Breton bolc'h "flax pod;" Serbian buljiti "to stare, be bug-eyed;" Serbo-Croatian blazina "pillow."

An extended form of the root, *bhelgh- "to swell," forms all or part of: bellows; belly; bilge; billow; bolster; budget; bulge; Excalibur; Firbolgs.

An extended form of the root, *bhleu- "to swell, well up, overflow," forms all or part of: affluent; bloat; confluence; effluent; effluvium; efflux; fluctuate; fluent; fluid; flume; fluor; fluorescence; fluoride; fluoro-; flush (v.1) "spurt, rush out suddenly, flow with force;" fluvial; flux; influence; influenza; influx; mellifluous; phloem; reflux; superfluous.
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