research and development.
1. (not in technical use) recommended daily allowance. Compare . 2. . abbreviation 1. Recommended Daily or Dietary Amount or Allowance 2. (in England) Regional Development Agency RDA abbr. recommended daily allowance 1. recommended daily allowance 2. remote database access 3. Rural Development Administration
Symbol, Chemistry. 1. .
- Rd and d
1. research, development, and demonstration.
- Rd and e
1. research, development, and engineering.