[in.grain] vt (ca. 1641): to work indelibly into the natural texture or mental or moral constitution syn see infuse
[2]in.grain adj (1766) 1 a: made of fiber that is dyed before being spun into yarn b: made of yarn that is dyed before being woven or knitted
2: thoroughly worked in: innate [3]in.grain n (ca. 1890): innate quality or character