A panic grass (Panicum virgatum) native to North America and used as rangeland forage and hay.(noun)
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.
Use "switchgrass" in a sentence
"During the two day Brownfields Conference where a number of topics are being discussed the word switchgrass is thrown around a lot."
""Cellulosic ethanol" would use non-food plants such as switchgrass, which is one of the most promising bioenergy crops."
"What caught my eye was switchgrass, which is grows in the US, grows fast and (also according to wikipedia) "for every unit of energy input, switchgrass yields four units out"."