back
nounmasculine/ˈdoɾsu/medium
dor·so
Definitions
1The back of the human body or of an animal.
He had a tattoo on his upper back.
The horse's back was strong and broad.
Common collocations
back of the handspine of a bookanimal's back
2The part opposite the front or main side of an object (e.g., book, leaf, coin).
The author's name is on the spine of the book.
The coin's reverse shows an eagle.
Etymology
Do latim 'dorsum'.