Yes, the physically twisted one is measured in degrees. Some people also talk how much the twist is in inches or mm's. The inches/mm amount actually is of less value as it's means little unless the wing chord and span are known. The amount of washout in inches on one airplane really doesn't give much clue what amount to washout a different size airplane to get the same effect.

If it's an aerodynamic washout, there isn't really a convenient and easy way to describe it in a single measurement.