o' /ə, o/
O'. A prefix to Irish family names, which signifies grandson or descendant of, and is a character of dignity; as, O'Neil, O'Carrol.
O' prep. A shortened form of of or on. “At the turning o' the tide.”
◄ ►
O
n 1: the blood group whose red cells carry neither the A nor B
antigens; "people with type O blood are universal
donors" [syn: type O, group O]
2: 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 [syn: oxygen, atomic
number 8]
3: the 15th letter of the Roman alphabet