Dictionary.net

• A circular plate or a cross, with two or more cross grooves intersecting at the center, used on the end of a shaft to transmit motion to another shaft not in line with the first.

2010 - New Age Dictionary Database
By Oddity Software

• A circular plate or a cross, with two or more cross grooves intersecting at the center, used on the end of a shaft to transmit motion to another shaft not in line with the first.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.