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The Collaborative International Dictionary
Interserting

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
interserting

vb. (present participle of intersert English)