1. The person or persons that; the one that
   "I'm the one who bought it" 
2. What or which person or persons?
   "who gave you the book?"

1. A United Nations agency to coordinate international health activities and to help governments improve health services
   - World Health Organization, World Health Organisation [Brit]

Type of: UN agency, United Nations agency

Encyclopedia: WHO

• soddy
• sodium
• sodium benzoate
• sodium bicarbonate
• sodium bichromate
• sodium carbonate
• sodium carboxymethyl cellulose
• sodium chlorate
• sodium chloride
• sodium cyanide
• sodium dichromate
• sodium ethylmercurithiosalicylate
• sodium fluoride
• sodium hydride
• sodium hydrogen carbonate
• sodium hydroxide
• sodium hypochlorite
• sodium iodide
• sodium lauryl sulfate
• sodium lauryl sulphate
• sodium nitrate
• sodium nitrite
• sodium orthophosphate
• sodium phosphate
• sodium pyrophosphate