Definition of "reg" in English

noun

1. (informal) A regular.

   • I've been going to that chat room for months, and I know most of the regs by now.

2. (informal) A regulation.

3. registrar

4. registration

5. registry

noun

1. (geography) A hard surface of rock fragments set in a sandy matrix, found in some hot deserts; regolith, stony desert.