Alternative form of of

(organic chemistry) ortho-

A blood type that has no antigens. It lacks the A, B and Rh factors on the blood cells. It is the universal donor for blood and can give blood to any blood type, but can only receive O- blood.

plural of O

plural of the letter o

(linguistics) Initialism of Oxford English Dictionary.

(pharmacology) a monoclonal antibody derived from a murine source

A linking vowel inserted interconsonantally between two morphemes, to ease pronunciation, without contributing to the meaning. It frequently joins words or combining forms of Ancient Greek or Classical Latin origin in the classical compounds of New Latin and international scientific vocabulary, but it can also be used to join modern terms and even abbreviations, either formally or informally.

A colloquializing suffix, typically appended to names, abbreviations of long words, or substantive uses of adjectives.

(humorous) Converts certain words to faux Italian or Spanish. Can be used with Spanish el for expressions such as el stinko.