Proto-IE: *ardhw-
Meaning: tall; to grow
Old Indian: r̥dhṇoti, r̥ṇaddhi, r̥dhati `to grow, increase, prosper, succeed', árdhuka- `prospering'
Avestan: ǝrǝdwa- `hoch'
Armenian: ? ordi `Sohn', urǯu `Stiefsohn'
Latin: arduus, -a `hoch, steil, schwierig'
Celtic: Gaul Arduenna silva; OIr ard `hoch, gross'
Russ. meaning: высокий; расти
References: WP I 148 f
piet-meaning,piet-ind,piet-avest,piet-arm,piet-slav,piet-germ,piet-lat,piet-celt,piet-rusmean,piet-refer,