Indo-European etymology : Query result

Proto-IE: *rādh-

Meaning: to promote, to assist

Old Indian: rādhnóti, rādhyati, rā́dhyate, rādhati `to succeed, be accomplished or finished; to accomplish, achieve', rādha- m.n., rā́dhas n. `favour, gift, success, accomplishment'

Avestan: rāδaiti `macht bereit', rāδa- m. `Fürsorger', rādah- n. `Sichbereitstellen, Bereitwilligkeit (in religiöser Hinsicht)'

Other Iranian: OPers rādiy (loc. sg.) `wegen', NPers ārāyad, ārāstan `schmücken'

Slavic: *rāditi, *rādъ, *rādī

Baltic: *rā̂d-ī- (1) vb.

Germanic: *rōd-ia- vb., *rēd-a- vb., *rēd-ia- vb., *rēd-a- n., m.

Celtic: OIr immrādim `überlege, überdenke', OCymr amraud `mens', Cymr amrawdd `Gespräch'

Russ. meaning: способствовать

References: WP I 69 f