Definition of "undersurface" [undersurface]

• See underside. (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.

• "They appear late in March, being green above, with an undersurface which is white, and cottony."
• "Hypospadias is a condition that affects the development of the urethra along with the tissues that make up the undersurface of the penis."
• "I do love my multitouch Magic Mouse, but dragging it across a smooth surface prone to dirt and debris caused an infuriating scratching noise every few minutes, forcing me to drag the undersurface across my pants vigorously to clean it, tripping my various hot corners."