strand of pelage hair strand of guard hair monotrich hair UBERON:0010512 A long, straight truncal hair that contains two air cells in the medulla[MP]. A strand of hair from the top layer consisting of longer, often coarser, straight shafts of hair that stick out through the underfur. This is usually the visible layer for most mammals and contains most of the pigmentation. Wikipedia:Guard_hair guardhair EMAPA:36528 guard hair It protects the underfur from outside factors, such as rain, and is thus often water-repellent MA:0001896