The Collaborative International Dictionary
Intersert
Intersert \In`ter*sert"\, v. t. [imp. & p. p. Interserted; p.
pr. & vb. n. Interserting.] [L. intersertus, p. p. of
interserere to intersert; inter between + serere to join,
weave.]
To put in between other things; to insert. [Obs.]
--Brerewood.
Wiktionary
intersert
vb. (context obsolete transitive English) To put in between other things; to insert.