15 letters · 20 points in Scrabble
noun protection against harmful effects of radiation
originEtymology tree English radio- Proto-Indo-European *per-der.? Proto-Indo-European *per-der.? Proto-Indo-European *pér Proto-Indo-European *-o Proto-Indo-European *pró Proto-Indo-European *pro- Proto-Italic *pro- Late Latin pro- Proto-Indo-European *(s)teg-der. Proto-Italic *tegō Late Latin tegō Late Latin prōtegō Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō…
Etymology from Wiktionary, CC BY-SA 3.0