a brush for applying paint, as one used in painting houses or one used in painting pictures.
any plant of the genus Castilleja.

1820–30; paint + brush1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
paintbrush (ˈpeɪntˌbrʌʃ)
a brush used to apply paint

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

Paintbrush definition

graphics, tool
A Microsoft Windows tool for creating bitmap graphics.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Encyclopedia Britannica


device composed of natural or synthetic fibres set into a handle that is used for cleaning, grooming, polishing, writing, or painting. Brushes were used by man as early as the Paleolithic Period (began about 2,500,000 years ago) to apply pigment, as shown by the cave paintings of Altamira in Spain and the Perigord in France. In historical times the early Egyptians used brushes to create their elaborate tomb paintings, while the ancient Chinese employed the tip of a long-haired brush to make the many intricate characters of their writing, a practice continued in the Orient today.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Authors and artists do not generally consult the statute books before deciding
  whether or not to pick up pen or paintbrush.
And instead of a paintbrush, he has weapons-grade ordnance.
Then unexpectedly, he picked up can and paintbrush and started to move around
  the canvas.
Rinse the paintbrush out between uses, so it will stay soft and easy to use.
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