- one of the minute, wormlike processes on certain membranes, especially on the mucous membrane of the small intestine, where they serve in absorbing nutriment.
- one of the long, soft, straight hairs covering the fruit, flowers, and other parts of certain plants.
- any of the numerous finger-like projections of the mucous membrane lining the small intestine of many vertebrates
- any similar membranous process, such as any of those in the mammalian placenta
- any of various hairlike outgrowths, as from the stem of a moss
