Exhibiting radioactivity. / (figuratively, rare) Dangerous and disgusting, particularly of people or ideas.

Initialism of general availability. / (aviation, general) Initialism of general aviation. / (wikis) Initialism of good article. / (netball) Initialism of goal attack.

(cardiology, pathology) Synonym of myocardial infarction

(grammar) a clause that is the subject of a sentence