Trial jury
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
A jury, usually of twelve men, impaneled to try questions of fact submitted to them by the court and to render their verdict thereon.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The jury participating in the trial of a given case; or a jury summoned and impaneled for the trial of a case, and in this sense a petit jury as distinguished from a grand jury
Defined under Trial in Black's Law Dictionary.