Preferred label: 

Describes the surface of the outside of an animal skin, which contains the hair folllicles by which the skins are most often identified.

Etherington & Roberts (1982)

Roberts, Matt, Don Etherington, and Margaret R. Brown. 1982. Bookbinding and the conservation of books: a dictionary of descriptive terminology. Washington: Library of Congress.

Additional reference: (modified)
Alternative label: 
grain side
Broader concept: 
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