Cubit - Vine's Expository Dictionary of New Testament Words

Cubit

[ 1,,G4083, pechus ]
denotes the forearm, i.e., the part between the hand and the elbow-joint; hence, a measure of length," not from the wrist to the elbow, but from the tip of the middle finger to the elbow joint, i.e., about a foot and a half, or a little less than two feet, Matthew 6:27; Luke 12:25; John 21:8; Revelation 21:17.

Vine's Expository Dictionary of New Testament Words