ghrendh- / Indo-European roots
Examples of words with the root ghrendh-: chondro-, frenum, grind, grist, hypochondria, mitochondrion, refrain.
1. grind from Old English grindan, to grind, from Germanic *grindan.
2. grist from Old English grīst, the action of grinding, from Germanic *grinst-, a grinding.
3. fraise, frenulum, frenum; refrain1 from Latin frendere, to grind.
4. Sometimes but improbably regarded as from this root (in variant form *ghrend-) is Greek khondros, granule, groats, hence cartilage chondro-; hypochondria, mitochondrion
[Pokorny ghren- 459.]