@neorasp
The final word is actually tabesasu, which is the same verb (eat) as taberu, but conjugated in the causative form.
食べる - taberu
食べさす - tabesasu
The causative form is used when saying "make" someone do something or "let" someone do something, so I changed "make (someone) eat" to just "feed."
You can read more about that here (also a wonderful resource in general): http://www.guidetojapanese.org/learn/grammar/causepass