O or o

[ oh ]

noun, plural O's or Os; o's or os or oes.

the fifteenth letter of the English alphabet, a vowel.

any spoken sound represented by the letter O or o, as in box, note, short, or love.

something having the shape of an O.

a written or printed representation of the letter O or o.

a device, as a printer's type, for reproducing the letter O or o.

First recorded in 1125–75; Middle English, from Old French, from Latin ō

the Arabic cipher; zero.

(sometimes lowercase) the medieval Roman numeral for 11.Compare Roman numerals.

Physiology: a major blood group, usually enabling a person whose blood is of this type to donate blood to persons of group O, A, B, or AB and to receive blood from persons of group O.Compare ABO system.

Chemistry: oxygen.

Logic: particular negative.

the typical ending of the first element of compounds of Greek origin (as -i- is, in compounds of Latin origin), used regularly in forming new compounds with elements of Greek origin and often used in English as a connective irrespective of etymology

O or o

[ oh ]

noun, plural O's or Os; o's or os or oes.

the fifteenth letter of the English alphabet, a vowel.

any spoken sound represented by the letter O or o, as in box, note, short, or love.

something having the shape of an O.

a written or printed representation of the letter O or o.

a device, as a printer's type, for reproducing the letter O or o.

First recorded in 1125–75; Middle English, from Old French, from Latin ō

the Arabic cipher; zero.

(sometimes lowercase) the medieval Roman numeral for 11.Compare Roman numerals.

Physiology. a major blood group, usually enabling a person whose blood is of this type to donate blood to persons of group O, A, B, or AB and to receive blood from persons of group O.Compare ABO system.

Chemistry. oxygen.

Logic. particular negative.

the typical ending of the first element of compounds of Greek origin (as -i- is, in compounds of Latin origin), used regularly in forming new compounds with elements of Greek origin and often used in English as a connective irrespective of etymology

O or o [ oh ] noun, plural O's or Os; o's or os or oes.

the fifteenth letter of the English alphabet, a vowel.

any spoken sound represented by the letter O or o, as in box, note, short, or love.

something having the shape of an O.

a written or printed representation of the letter O or o.

a device, as a printer's type, for reproducing the letter O or o.