voir dire 
(vwär dîr)
(vwär dîr)n.
The formal examination of a prospective juror under oath to determine suitability for jury service or of a prospective witness under oath to determine competence to give testimony.
tr.v. voir dired, voir dir·ing, voir dires
To conduct a voir dire of: voir dired the witness.
[Anglo-Norman, to speak the truth : Latin vērus, true; see wērə-o- in the Appendix of Indo-European roots + Latin dīcere, to say; see deik- in the Appendix of Indo-European roots.]