Gun·ter(gŭn′tər), Edmund 1581-1626.
English astronomer and mathematician who invented a surveying chain, quadrant, and scale and introduced the trigonometric terms cosine and cotangent.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.