The Proto-Celtic word *brig
Word *brig
Meaning mountain
Synonyms *monjo-

Other words that might be of interest
*kʷranno ‘tree’, *beljā ‘leaf, tree’, *arto ‘stone’, *gallo ‘stone’, *krako ‘stone’, *tela-mon ‘earth’, *ūrā- ‘earth’, *φī-wer-jō(n) ‘land, earth’, *brendo- ‘hill’, *tumbo- ‘hill’