Medical Definition of abluminal
: forming, involving, or occurring on the outer surface of a body part or device with an internal cavity or channel : not adjacent to the lumen of a tubular organ or part … the abluminal surface of the stent …—Ron Waksman, The Lancet, 3 Oct. 2008 We have observed that the individual extravasated cells extend pseudopodial projections that wrap around the abluminal surface of vessel …—Ann F. Chambers et al., in Advances in Cancer Research, 2000
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