Of course "Christ" isn't found in the Old Testament. It s based on the Greek word, "Christos" and the OT was written in Hebrew, where the equivalent word was "Messiah".
"Christ" means "anointed." Strong's Concordance has this entry:
"G5547
Χριστός
Christos
khris-tos'
From G5548; anointed, that is, the Messiah, an epithet of Jesus: - Christ."
What is your source for saying that "Christ" means "anointed with the anointing?"