\Or"ga*non\, Organum \Or"ga*num\, 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.