Definitions for "Semi-arid"
Keywords:  arid, rainfall, climate, ppen, steppe
lands where rainfall is so low and unreliable that crops cannot be grown with any reliability ( see arid zone)
Climate of 250 – 500 mm annual rainfall.
a climatic region having an annual precipitation, usually between 25.4 and 50.8 centimeters (10-20 inches) per year, this being greater than a truly arid climate; typically, the vegetation is composed of grasses with or without woody plant layers.