Definition of pinbrain:
(v) :
(transitive, figuratively) To make (something) deeply part of something else.
(v) :
(transitive) To dye with a fast or lasting colour.
(adj) :
(figurative, by extension) Thoroughly inwrought; forming an essential part of the substance.
(n) :
An ingrain fabric, such as a carpet.
(adj) :
Dyed with grain, or kermes.
(adj) :
Dyed before manufacture; said of the material of a textile fabric.