(1) A prolonged chronic shortage of water, as compared to the norm, often associated with high temperatures and winds during spring, summer and fall. (2) A period without precipitation during which the soil water content is reduced to such an extent that plants suffer from lack of water.
Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.