o

(n) 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 atomic number 8, oxygen,
(n) the 15th letter of the Roman alphabet
(n) the 15th letter of the Roman alphabet
(n) the blood group whose red cells carry neither the A nor B antigens
- people with type O blood are universal donors
group O, type O,

atomic number 8 oxygen group O type O

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oaf oafish Oahu Oahu Island oak oak apple oak blight oak chestnut oaken oak fern Oakland Oak Leaf Cluster oakleaf goosefoot oak-leaved goosefoot Oakley oak tree oakum oar oarfish oarlock oarsman oarsmanship oarswoman OAS oasis oast oast house oat oatcake oat cell carcinoma oaten Oates oath oatmeal oatmeal cookie Oaxaca Oaxaca de Juarez OB Obadiah obbligato obduracy obdurate obdurately obeah obeche obechi obedience obedience plant obedient obediently obedient plant obeisance obelion obelisk Oberson obese obesity obesity diet obey obfuscate obfuscation obi obidoxime chloride obiism obit obiter dictum obituary object object ball object code object glass objectification objectify objection objectionable objectionableness objectionably objective objective case objective lens objectively objectiveness objectivity object language object lens object lesson object of a preposition object of the verb objector object-oriented database object-oriented database management system object-oriented programing object-oriented programing language object-oriented programming object-oriented programming language object program object recognition objet d'art objurgate objurgation