A·ves·tan 
(ə-vĕstən)
(ə-vĕstən)n.
The eastern dialect of Old Iranian, in which the Avesta is written.
adj.
1. Of or relating to Avestan.
2. Or or relating to the Avesta.
- radically
- radical mastectomy
- radicalness
- radical sign
- radicand
- radicchio
- radices
- radicle
- radii
- radio
- radio-
- radioactive
- radioactive decay
- radioactively
- radioactive series
- radioactivity
- radio astronomy
- radio beacon
- radio beam
- radiobiological
- radiobiologist
- radiobiology
- radiobroadcast
- radiocarbon
- radiocarbon dating