Definition of
O
- (noun, body) the blood group whose red cells carry neither the A nor B antigens
- (noun, communication) the 15th letter of the Roman alphabet
- (noun, substance) 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
via WordNet, Princeton University
Synonyms of O
Alternate forms of O
Hyponyms: liquid oxygen, lox
Hypernyms: alphabetic character, blood group, blood type, chemical element, element, gas, letter, letter of the alphabet
Origin of the word O
- interj. of fear, surprise, admiration, etc., see oh. more
- blood type, 1926, originally "zero," denoting absence of A and B agglutinogens. more
via Online Etymology Dictionary, ©2001 Douglas Harper