The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
wegh-
DEFINITION:
To go, transport in a vehicle. Oldest form *weh-, becoming *wegh- in centum languages. Derivatives include weight, away, wagon, earwig, devious, trivial, and vex. 1.weigh1, from Old English wegan, to carry, balance in a scale, from Germanic *wegan.2.wee, from Old English wg(e), weight, unit of weight, from Germanic lengthened-grade form *wg.3. Suffixed form *wegh-ti-.weight, from Old English wiht,gewiht, weight, from Germanic *wihti-.4a.way; always, away, from Old English weg, way; b.Norwegian, from Old Norse vegr, way; c.thalweg, from Old High German weg, way. a–c all from Germanic *wegaz, course of travel, way. 5. Suffixed o-grade form *wogh-no-.a.wain, from Old English wæ(g)n, wagon; b.wagon, from Middle Dutch wagen, wagon. Both a and b from Germanic *wagnaz.6. Suffixed o-grade form *wogh-lo-.a.walleyed, from Old Norse vagl, chicken roost, perch, beam, eye disease, from Germanic *waglaz;b.ochlocracy, ochlophobia, from Greek okhlos, populace, mob (< “moving mass”). 7. Distantly related to this root are: a. (i)graywacke, from Old High German waggo,wacko, boulder rolling on a riverbed, from Germanic *wag-, “to move about”; (ii)wag1, from Middle English waggen, to wag, possibly from Germanic *wag-;b.vogue, from Old French voguer, to row, sail, from Old Saxon *wogn, to rock, sway, from Germanic *wga-, water in motion; c. (i)earwig, from Old English wicga, insect (< “thing that moves quickly”); (ii)wiggle, from Middle Dutch and Middle Low German wiggelen, to move back and forth, wag. Both (i) and (ii) from Germanic *wig-.8. Basic form *wegh-.vector, vehement, vehicle; advection, convection, evection, invective, inveigh, from Latin vehere (past participle vectus), to carry. 9. Suffixed basic form *wegh-y-.foy, via, viatical, voyage; convey, convoy, deviate, devious, envoi, envoy1, invoice, obviate, obvious, ogee, ogive, pervious, previous, trivial, trivium, viaduct, from Latin via, way, road. 10. Suffixed form *wegh-s-.vex, from Latin vexre, to agitate (< “to set in motion”). 11. Probably suffixed form *wegh-so-.convex, from Latin convexus, “carried or drawn together (to a point),” convex (com-, together; see kom). (Pokorny eh- 1118.)
h-, becoming *wegh- in centum languages. 
g(e), weight, unit of weight, from Germanic lengthened-grade form *w
g
. 3. Suffixed form *wegh-ti-. weight, from Old English wiht, gewiht, weight, from Germanic *wihti-. 4a. way; always, away, from Old English weg, way; b. Norwegian, from Old Norse vegr, way; c. thalweg, from Old High German weg, way. a–c all from Germanic *wegaz, course of travel, way. 5. Suffixed o-grade form *wogh-no-. a. wain, from Old English wæ(g)n, wagon; b. wagon, from Middle Dutch wagen, wagon. Both a and b from Germanic *wagnaz. 6. Suffixed o-grade form *wogh-lo-. a. walleyed, from Old Norse vagl, chicken roost, perch, beam, eye disease, from Germanic *waglaz; b. ochlocracy, ochlophobia, from Greek okhlos, populace, mob (< “moving mass”). 7. Distantly related to this root are: a. (i) graywacke, from Old High German waggo, wacko, boulder rolling on a riverbed, from Germanic *wag-, “to move about”; (ii) wag1, from Middle English waggen, to wag, possibly from Germanic *wag-; b. vogue, from Old French voguer, to row, sail, from Old Saxon *wog
-. foy, via, viatical, voyage; convey, convoy, deviate, devious, envoi, envoy1, invoice, obviate, obvious, ogee, ogive, pervious, previous, trivial, trivium, viaduct, from Latin via, way, road. 10. Suffixed form *wegh-s-. vex, from Latin vex
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