— prehistorically , adv.
/pree'hi stawr"ik, -stor"-, pree'i-/ , adj.
1. of or pertaining to the time or a period prior to recorded history: The dinosaur is a prehistoric beast.
2. Slang. outdated; passé: My mom has these prehistoric ideas about proper dress.
Also, prehistorical .
[ 1850-55; PRE- + HISTORIC ]