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Medical Definition of Polster
1. A bulge of smooth muscle cells, as in the penile arteries and veins, formerly thought to regulate blood flow. Origin: G. Cushion, bolster (05 Mar 2000)
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1. A bulge of smooth muscle cells, as in the penile arteries and veins, formerly thought to regulate blood flow. Origin: G. Cushion, bolster (05 Mar 2000)