The Collaborative International Dictionary
Interscribe
Interscribe \In`ter*scribe"\, v. t. [imp. & p. p. Interscribed; p. pr. & vb. n. Interscribing.] [L. interscribere; inter between + scribere to write.] To write between. [R.]
Wiktionary
interscribe
vb. (context transitive English) To write or draw between.