On the units I've seen in the wild the term "aed" or "AED" appears in nearly every case, but the word "defibrillator" is frequently absent.
That said, while the debate ranges on the tag name, there are other issues of tagging that need some attention. For example access: http://wiki.openstreetmap.org/wiki/File:Defilbulator_Shropshire.jpg As some aed's like the one above are locked or require a code. An example non-OSM aed map is: http://www.aedlocator.org/
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