Noun. 1. vas deferens-a duct that carries spermatozoa from the epididymis to the ejaculatory duct. ductus deferens.
Judge Advocate General of the Navy. The Judge Advocate General of the Navy (JAG) is the highest-ranking uniformed lawyer in the United States Department of the Navy. The Judge Advocate General is the principal advisor to the Secretary of the Navy and the Chief of Naval Operations on legal matters pertaining to the Navy.
In short, the JAG Corps is the legal branch of the military concerned with military justice and military law. 1  The chief attorney in each branch is the Judge Advocate General, and everyone under him or her is considered a Judge Advocate. Colloquially, however, any military lawyer is considered a JAG.