Automatic Activation Device. A device that senses rate of descent and altitude and which will attempts to mechanically activate the reserve parachute if the skydiver passes below a set altitude at a high rate of descent Found on http://www.encyclo.co.uk/local/20082
AAD: American Association of Dermatology, one of many important professional societies in the health arena. The AMA (the American Medical Association) is a better known example in the US. Only a small selection of the many health-related organizations is given as a sampler in this DICTIONARY. Found on http://www.medterms.com/script/main/art.asp?articlekey=2074