Strong's #5580: pseudochristos (pronounced psyoo-dokh'-ris-tos)
from 5571 and 5547; a spurious Messiah:--false Christ.
Thayer's Greek Lexicon:
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pseudochristos
1) a false Christ (or Messiah)
2) one who falsely lays claim to the name and office of the Messiah
Part of Speech: noun masculine
Relation: from G5571 and G5547
Usage:
This word is used 2 times:
Matthew 24:24: "For there shall arise false Christs, and false prophets, and shall show great"
Mark 13:22: "For false Christs and false prophets shall rise, and shall show signs"