Examples of Proto-Indo-European vowel gradation (ablaut”) exemplified in the Audio Etymological Lexicon

Root
e grade o grade zero grade




√*bʰ—dʰ
“dig, stab”
*bʰedʰ‑ > Lithuanian badýti “to stab” *bʰodʰ- > bed




√*bʰ—r
“to bear”
*bʰer- > bear *bʰor-no- > bairn *bʰr-nos > born, borne




√*bʰ—udʰ
“awake, aware”
*bʰeudʰ‑ > bid
*bʰudʰ‑ > bode




√*bʰl—g
“shine”
*bʰleg‑, possibly related to *bʰléiǵ‑ > Lithuanian blizgė “shone” *bʰlog‑ > black




√*dʰ—h₁
“do, put”
*dʰeh₁- > Bosnian nedelja “not-doing” i.e. “Sunday, week”; *dʰéh₁-ti- [dʱe:ti] > deed *dʰoh₁- [dʱo:] > do




√*dʰ—uh₂
“smoke, mist”

*dʰouh₂ [dʱoʊɐ] > dew *dʰuh₂ [dʱuɐ] > Siraiki dhuul “dust”




√*ǵ—l *ǵel- > chill *ǵól-to- > cold
“cold” Possibly related: *ḱel-to- > Persian سرد sard “cold”





√*gʰ—rdʰ
“enclose”
*gʰerdʰ‑ > gird *gʰordʰ-o‑ > garden *gʰrdʰ‑ > Persian کرت chart “plot”




√*ǵʰ—lh₃
“gleam, yellow”
*ǵʰelh₃-wos [g̟ʱelʋus] > yellow
*ǵʰlh₃-to- [g̟ʱl̩t—] > gold




√*gʷ—m
“to step”
*gʷem‑ > come *gʷe-gʷom- > came




√*gʷʰ—r
“warm, hot”
*gʷʰer‑ > Ancient Greek θερμός thermos “warm” *gʷʰor-mo- > warm




√*h₁r—udʰ
“red”
*h₁reudʰ- [hrəʊdʱ] > Latvian [h]ruds “red” *h₁roudʰ- [hroʊdʱ] > red




√*h₁w—bʰ
“weave”
*h₁webʰ‑ > web *h₁wobʰ‑seh₂ > wasp




√*h₁w—idʰh₁
“separate, divide”
*h₁weidʰh₁- [hweidʱɘ̥] > wide
*h₁widʰh₁-uh₂- [hwidʱəwaħ] > widow




√*h₂—iḱ
“own”

*h₂e-h₂oiḱ- [ɐħɑik̟ʲ] > owe, own *h₂iḱ- [ħik̟ʲ] > Sanskrit ईष्टे ishte “own”




√*h₂—us
“dawn”
*h₂eus- [hɛus] > east
*h₂us‑ > Sanskrit उषस् ushas “dawn”




√*kr—ŭh₂
“raw meat, fresh blood”
*kreuh₂- [kɾeʊħ] (sounds more like [kɾeɐħ]) > Ancient Greek κρέας ‎kreas “flesh” *krouh₂- [kɾoʊħḁ] > raw




√*ḱ—r
“horn, head”
*ḱer-h₂- > hart *ḱor-h₂- > Lithuanian karvė “cow”




√*ḱw—ĭd
“shine”
*ḱweid ~ *ḱweit > Persian سفید sefid “white” *ḱwoid > wheat




√*l—ĭkʷ
“leave”
*leikʷ‑ > Persian ریختن rikh(tan) “pour, spill, sprinkle” *loikʷ‑ > loan




√*l—ĭp
“to stick, fat”
*leip‑ > Bosnian ljepilo “glue” *loip‑ > leave (over)




√*l—ŭbʰ
“love, desire”
*leubʰ- > Bosnian ljubav “love”
*lubʰ‑ > love, Sanskrit लुभ्यति lubhyati “to desire greatly”




√*m—lh₂
“grind, crush”
*melh₂‑ > Ancient Greek μέλας melas “black” (cf. melanoma)
*ml̥h₂-téh₂ [ml̩:teħ] > mould




√*m—nk
“mix, knead”
*menk‑ > Bosnian mek “soft” *monk‑ > mingle




√*p—lh₁
“fallow”
*pelh₁‑ [pelə] > Latvian pelēks “grey” *polh₁-uo [polwo]
> fallow





√*p—nt
“pass, path”
*pént-e‑ > find *pónteh₁s [ponte:s] > Latin pons, Iranian *paθa > path




√*p—r
“passage”

*pór-e‑ > fare *pr̥tu- [pr̩tʰu] > ford




√*pr—h₂
“before”
*preh₂- [pʰreɐ] > first
*prh₂-mH- former, Latin prīmus > prime




√*s—d *sed- > sit *sod- > sat *-sd-, in *ni-sd-o [nizdo] > nest
“sit, settle” *sēd-i‑ > seat *so:d-o- > soot




√*s—ŋ
“intone”
*sengʷʰ‑e- > sing *songʷʰ‑o- > Proto-Germanic *sang [sɑŋ] > song, sang [sæŋ]




√*t—ng
“think, feel, know”

*tong > thank *tng > think




√*t—rh₂
“cross over, pass through”
*terh₂‑, *terh₂-kʷe [terɐ̥kwe] > thorough
*trh₂- [trħa] > Sanskrit तिरस् tiras “through”




√*w—s
“to dress, clothe”
*wes > Albanian vesh “to dress” *wos > wear