English
Noun
nerf ball ™
- (Trademark owned by Hasbro corporation) Any small foam ball, soft and very light, designed for indoor use.
#: Getting hit by a Nerf® ball doesn't hurt at all.
#: This mini nerf ball whistles when thrown hard and flies really well. Unlike its bigger brother, this Vortex Nerf ball is much softer and lighter, perfect for kids 1
Usage notes
Like many trademarked terms, this term is also used generically in common speech. However, Hasbro would prefer that it always be capitalized in written text, and a trademark notice added.
References
http://www.hasbro.com/nerf/
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