Definition of "roller" []

• One that rolls or performs a rolling operation or activity. (noun)
• Any of various cylindrical or spherical devices that roll or rotate, especially: (noun)
• A small spokeless wheel, such as that of a roller skate or caster. (noun)
• An elongated cylinder on which something, such as a window shade or towel, is wound. (noun)
• A heavy revolving cylinder that is used to level, crush, or smooth. (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.

• "We are entering now what I call the roller-coaster period in the campaign in that John Kerry will pick his running mate and have his convention."
• "Z: We have with a little bit of what I call a roller coaster ride."
• "It's like running over a field of boulders in roller skates."