The study of a culture just before the time of its earliest recorded history.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "protohistory" in a sentence
"The other kind of sonic blaster (UPDATE: SRL protohistory!)"
"Link to danwei. org post about sex gizmos in Chinese protohistory."
"Previously he was director of protohistory at Istanbul University"