o

– definition :

(noun)
1. the blood group whose red cells carry neither the A nor B antigens (context:body)
2. the 15th letter of the Roman alphabet (context:communication)
3. a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth’s crust (context:substance)

– Sample : “o”