AZOIC - is a valid Scrabble word.
Definition of AZOIC:
- or relating to the part of geologic time that antedates life compare archean 1
- (formerly) noting or pertaining to the Precambrian Era, esp. that part formerly believed to precede the first appearance of life; Archean
- having no living beings
- of, pertaining to, or characteristic of the azo group
- without life [adj]