no, mad and nomads

The Oxford Advanced Learner`s Dictionary (http://oald8.oxfordlearnersdictionaries.com/dictionary/mad) states as follows:

mad: having a mind that does not work normally; mentally ill

In consequence no mad should mean normally working, mentally sane

According to Wikipedia (http://en.wikipedia.org/wiki/Nomad):

Nomad:  is a member of a community of people who move from one place to another.

Nomadism: is a lifestyle adapted to infertile regions such as steppetundra, or desert, where mobility is the most efficient strategy for exploiting scarce resources