Definition of "roll-on" [roll-on]

• Of or being a substance, such as a deodorant, that is dispensed from a container having a rolling ball at one end serving as an applicator. (adjective)

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.

• "Leigh pops in with her five yorkies, all in roll-on carry-on bags or Mary stops in after just getting back from India, to show off what she got there."
• "In practical terms, that means another item added to my packing list — a small roll-on tube of Aerogard to keep the mozzies at bay."
• "They are often in the form of stones to rub on underarms, but the same ingredients can be in roll-on form."