a kind of limestone, of building quality, found at Oamaru on South Island, New Zealand
[oh uh nd oh] /ˈoʊ ənd ˈoʊ/ 1. owned and operated.
/ˈoːnʃəx/ noun 1. (Irish) a foolish girl or woman
- O antigen
O antigen n. A somatic antigen of nonmotile bacteria.
1. U.S. Aerospace. Orbiting Astronomical Observatory: one of a series of scientific satellites that studied astronomical phenomena at ultraviolet and x-ray wavelengths. orbiting astronomical observatory