vasovesiculitis 1. Inflammation of the vas deferens and seminal vesicles; usually occurring with prostatitis 2. Inflammation of the ductus deferentes, vasa deferentia, (excretory duct of the testis, which unites with the excretory duct of the seminal vesicle to form the ejaculatory duct) and seminal vesicles. Found on http://www.wordinfo.info/words/index/info/view_unit/2286/