Senior counsel
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Of two or more counsel retained on the same side of a cause, 'he is the "senior" who is the elder, or more important in rank or estimation, or who is charged with the more difficult or important parts of the management of the case.
Defined under Senior in Black's Law Dictionary.