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Definition of Dead space
1. Noun. (context: physiology) Air that is inhaled by the body in breathing, but does not partake in gas exchange. ¹
2. Noun. (film) Picture information that is either masked off or cropped out of viewing area, whether at the top or bottom, or to the sides. ¹
¹ Source: wiktionary.com
Medical Definition of Dead space
1. A cavity, potential or real, remaining after the closure of a wound which is not obliterated by the operative technique. See: anatomical dead space, physiologic dead space. (05 Mar 2000)