Definition of "zonal" []

• Of or associated with a zone. (adjective)
• Divided into zones. (adjective)
• Geology Of or relating to soil characterized by well-developed horizons, reflecting the type of vegetation the soil supports and the climate to which it is exposed. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "What are known as zonal geraniums are the species Pelargonium zonale, which originates in the mild Cape region of South Africa."
• "These storms are a function of the temperature difference across the boundary between the cool polar air and warm subtropical air often referred to as the zonal index."
• "Rejects the idea of zonal mutual recognition of products."