1 Increasing thoracic volume results in decreased pleural pressure, increased alveolar volume, decreased alveolar pressure, and air movement into the lungs.  Decreasing thoracic volume results in increased pleural pressure, decreased alveolar volume, increased alveolar pressure, and air movement out of the lungs.
Freebase(5.00 / 1 vote)Rate this definition: Orchard. An orchard is an intentional planting of trees or shrubs that is maintained for food production. Orchards comprise fruit or nut-producing trees which are grown for commercial production. Orchards are also sometimes a feature of large gardens, where they serve an aesthetic as well as a productive purpose.
: of or relating to the armed services. : used in serving or supplying. : intended for hard or everyday use. : an Old World tree (Sorbus domestica) resembling the related mountain ashes but having larger flowers and larger edible fruit. : a related Old World tree (S. torminalis) with bitter fruits.