Definition of "gunk" []

• Informal A thick greasy substance. (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.

• "Meanwhile, the brownish-blackish gunk is drifting along the coast to the northeast, Brower said."
• "It then looks at your photo to see how much that theoretical sunlight has been obscured, and from that calculates how much gunk is in the air (it doesn't work yet on highly cloudy days)."
• "The real gunk is on the three little rollers underneath the mouse that holds the ball in place."