v. to write on the exterior of, the surface of, or above.
v. to write (something) on the exterior of an object, such as a document or an envelope.
v. To address (an envelope etc.).
the GNU version of the Collaborative International Dictionary of English
v. To write or engrave (a name, address, inscription, or the like) on the top or surface; to write a name, address, or the like, on the outside or cover of (anything).
The Century Dictionary and Cyclopedia
To write or engrave on the top, outside, or surface; inscribe; put an inscription on.
To write the name or address of one on the outside or cover of: as, to superscribe a letter.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. write on the top or outside
v. write on the outside or upper part of
Word Usage
"She endeavoured in vain to superscribe it: so desired me to do it."