Strong's #4083: pechus (pronounced pay'-khoos)

of uncertain affinity; the fore-arm, i.e. (as a measure) a cubit:--cubit.

Thayer's Greek Lexicon:

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pēchus

1) a cubit

2) a measure of length equal to distance from the joint of the elbow to the tip of the middle finger (i.e. about 18 inches, (.5 m) but its precise length varied and is disputed)

Part of Speech: noun masculine

Relation: of uncertain affinity

Usage:

This word is used 4 times:

 

Matthew 6:27: "can add one cubit unto his stature?"
Luke 12:25: "his stature one cubit?"
John 21:8: "as it were two hundred cubits,) dragging the net with fishes."
Revelation 21:17: "wall thereof, a hundred and forty and four cubits, according to the measure of a man,"