Definition: Indicates the porosity (coverage) of the foliage during the winter months. Foliage porosity is an important factor when trees or shrubs are used as windbreaks for the protection of crops and livestock shelters. Denser (or less porous) foliage allows more wind to pass through.
Definition: A porosity quality inhering in a bearer by virtue of the bearer's being capable of admitting the passage of gas or liquid through pores or interstices. (or, as in fungi, solids such as spores may be admitted through pores in the hymenium, for example)