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Medical Definition of Dust cell
1. Macrophage found in lung and that can be obtained by lung lavage, responsible for clearance of inhaled particles and lung surfactant. Metabolism slightly different from peritoneal macrophages (more oxidative metabolism), often have multivesicular bodies that may represent residual undigested lung surfactant. This entry appears with permission from the Dictionary of Cell and Molecular Biology (22 Feb 2008)