law officer

noun

: a public official employed to administer or advise in legal matters:

or law officer of the crown usually capitalized C : the attorney general or the solicitor general of England

the opinions of the law officers of the Crown … are not usually laid before Parliament—

T. E. May

: an official of a general court-martial in the U.S. armed forces who may not vote but is charged with advising the members of the court on matters of law and who is appointed from the Judge Advocate General's Corps or from the bar of a federal court or the highest court of a state