Capable of being brushed or applied with a brush; able to withstand brushing without becoming damaged, matted, or ruined.
From 'brush' plus the suffix '-able' meaning capable of. It became common in the 20th century with the rise of consumer cosmetics and paint industries needing to describe product properties.
The word 'brushable' represents how consumer culture created new vocabulary—before mass-marketed cosmetics, nobody needed to describe whether something could be brushed, but now it's a major product feature.
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