Astronomical Term *Mezzocielo*
I've checked several sources. Where this term appears in dictionaries, it is translated with a definition, and not a gloss (usually if a direct translation exists in English only a gloss is given) For example https://en.wiktionary.org/wiki/mezzocielo intersection of the meridian of a given place with the celestial equator.  

I conclude that English speaking astronomers have not had the benefit of single word translation of mezzocielo.