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.
n. pl. citrus or citÂ·rusÂ·es. 1. Any of various evergreen, usually spiny shrubs or trees of the genus Citrus and other genera in the family Rutaceae, such as the grapefruit, lemon, and orange, native to South and Southeast Asia and widely cultivated for their juicy edible fruits with a leathery aromatic rind.itâ¢rus. 1. any small tree or spiny shrub of the genus Citrus, of the rue family, including the lemon, lime, orange, tangerine, grapefruit, citron, kumquat, and shaddock. 2. the fruit of any of these trees or shrubs, having a shiny, stippled skin, and tart-to-sweet juicy pulp. 3.