The Proto-Indo-European word *kert-
Word *kert-
Meaning twine, plait
Synonyms serk, *bʰer-, *weg-, *wei(h₁)-, *melk-, *plek̂-

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

Other words that might be of interest
*mer- ‘bind, braid’, *strenk- ‘string, to pull (tight)’