What is "superscribing"

Superscribe \Su`per*scribe"\, v. t. [imp. & p. p. Superscribed; p. pr. & vb. n. Superscribing.] [L. superscribere, superscriptum; super over + scribere to write. See Super-, and Scribe.] 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); as, to superscribe a letter.

vb. (present participle of superscribe English)