judge advocate

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A commissioned officer in the U.S. Army, Air Force, or Navy assigned to the Judge Advocate General's Corps.
2. n. A staff officer serving as legal adviser to a commander.
3. n. An officer acting as prosecutor at a court-martial.

Century Dictionary and Cyclopedia

1. n. See advocate.

Wiktionary

1. n. US A commissioned officer acting as a lawyer to advise a court martial on points of law or to act as prosecutor.

GNU Webster's 1913

1. n. See under Judge.
2. n. (Mil. & Nav.) a person appointed to act as prosecutor at a court-martial; he acts as the representative of the government, as the responsible adviser of the court, and also, to a certain extent, as counsel for the accused, when he has no other counsel.

WordNet 3.0

1. n. an officer assigned to the judge advocate general
2. n. a staff officer serving as legal adviser to a military commander