intersert
To put in between other things; to insert.
obsolete, transitive
If I may […]intersert a short speculation, the depth of the sea […]is determined in Pliny to be fifteen furlongs.
Where it comes from
From Latin intersertus, past participle of interserere (“to intersert”), from inter (“between”) + serere (“to join, weave”).
Adapted from the Wiktionary entry intersert (CC BY-SA 4.0).