Strong's #4431: ptosis (pronounced pto'-sis)

from the alternate of 4098; a crash, i.e. downfall (literally or figuratively):--fall.

Thayer's Greek Lexicon:

͂

ptōsis

1) a falling, downfall

Part of Speech: noun feminine

Relation: from the alternate of G4098

Citing in TDNT: 6:167, 846

Usage:

This word is used 2 times:

 

Matthew 7:27: "great was the fall of it."
Luke 2:34: "this child is set for the fall and rising again of many in"