The Proto-Indo-European word *kerdhehₐ-
Word *kerdhehₐ-
Meaning herd, series
Synonyms *wrētos, *wórghs

Comments
Mallory J.P. and Adams D. (2006)

Other words that might be of interest
*hₐeĝros ‘pasture, field’, *hₐeĝrehₐ- ‘hunt’, *poh₂imén- ‘herdsman’, *wélsu- ‘meadow, pasture’, *wéstor- ‘herdsman’