Strong's #4419: pterugion (pronounced pter-oog'-ee-on)
 neuter of a presumed derivative of 4420; a winglet, i.e. (figuratively) extremity (top corner):--pinnacle.
Thayer's Greek Lexicon:
 ́ 
 
  pterugion 
 
 1) a wing, a little wing
 2) any pointed extremity
 
 2a) of fins of fishes
 2b) of part of a dress hanging down in the form of a wing
 2c) of the top of the temple at Jerusalem
 
  Part of Speech: noun neuter
Relation: from a presumed derivative of G4420
 
Usage:
This word is used 2 times:
Matthew 4:5: "and setteth him on  a pinnacle of the temple,"
Luke 4:9: "set him on  a pinnacle of the temple, and said"