Prodelision is a form of elision in which the latter word loses its first vowels.
Example:
"Namqu(e) etsi nullum memorabile nomen
femina(e) in poena (e)st, habet haec victoria laudem,
exstinxisse nefas." (Aeneid 2.583-585)
The "e" of "est" elides in the second line, rather than the "a" of "poena." This is very common in Latin with forms of the verb "esse."
References
Prodelision Wikipedia(Text) CC BY-SA