The Collaborative International Dictionary
Opisthography
Opisthography \Op`is*thog"ra*phy\, n. [Gr. 'o`pisqen behind +
-graphy.]
A writing upon the back of anything, as upon the back of a
leaf or sheet already written upon on one side. [R.]
--Scudamore.
Wiktionary
opisthography
n. A writing upon the back of anything, as upon the back of a sheet already written upon on one side.