superscription

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Something written above or outside something else.
• noun The act of superscribing.
• noun The part of a prescription that bears the Latin word recipe represented by the symbol ℞.

from The Century Dictionary.

• noun The act of superscribing.
• noun That which is written or engraved on the outside of or above something else; especially, an address on a letter.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of superscribing.
• noun That which is written or engraved on the surface, outside, or above something else; specifically, an address on a letter, envelope, or the like.
• noun (Pharm.) That part of a prescription which contains the Latin word recipe (Take) or the sign �.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Something written (or engraved) on the surface, outside, or above something else; specifically, an address on a letter, envelope, etc.
• noun An editorial addition at the beginning, often indicating the authorship of a piece; compare colophon.
• noun The act of superscribing.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an inscription written above something else
• noun the activity of superscribing