What does OA mean in Physiology?
This page is about the meanings of the acronym/abbreviation/shorthand OA in the Medical field in general and in the Physiology terminology in particular.
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What does OA mean?
- Oa is a fictional planet that lies at the center of the DC Comics universe. Since its inception, Oa has been the planetary citadel of the Guardians of the Universe and the headquarters of the Green Lantern Corps. It first appeared in Green Lantern vol 2 #1, when the Guardians summoned Hal's "energy duplicate" so they could hear of his origin.