%organum%

{ ‖‖ } n. [ NL. organon, L. organum. See Organ. ] An organ or instrument; hence, a method by which philosophical or scientific investigation may be conducted; -- a term adopted from the Aristotelian writers by Lord Bacon, as the title (“Novum Organon”) of part of his treatise on philosophical method. Sir. W. Hamilton. [ 1913 Webster ]