O, n.
the blood group whose red cells carry neither the A nor B antigens
<noun.body>
O group O type O
sample sentences
"people with type O blood are universal donors"
semantic pointers
hypernym
the 15th letter of the Roman alphabet
<noun.communication>
O o
semantic pointers
member holonym
hypernym
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
<noun.substance> freq. cnt.: 39 freq. cnt.: 39
O atomic number 8 oxygen
semantic pointers
hypernym
substance holonym
hyponym