Lat. Somebody. French law. Some, one; somebody. This Latin word is used to express an unknown person, or one who cannot be named. 2. A quidam is usually described by the features of his face, the color of his hair, his height, his clothing, and the like in any process which may be issued against him. . 3. A warrant directing the officer to arrest the associates of persons named, without naming them, is void.
QUIDAM
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.