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abbr. |
Orbiting Astronomical Observatory; Original Art Only; orbiting astronomical |
abbr., earth.sc. |
Office of Aircraft Operations |
abbr., ed., scient. |
Office of Academic Opportunities |
abbr., el. |
orthonormal atomic-like orbitals |
abbr., med. |
Ontario Association Of Orthodontists; Opticians Association Of Ohio |
abbr., mil., avia. |
Operations Analysis Office |
abbr., oil |
on-line analog output |
abbr., ophtalm. |
ophthalmic artery occlusion (aao.org doc090) |
abbr., space |
orbital astronomical observatory |
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abbr. |
off and on |