idorgan

from The Century Dictionary.

• noun In biology, an ideal or potential organism; a plastid, or any one of the Protozoa or Protista, as a moner or amœba, as distinguished from any metazoic animal: implying evolutionary potentiality to develop into all higher forms of life, without the actuality of such a process.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Biol.) A morphological unit, consisting of two or more plastids, which does not possess the positive character of the person or stock, in distinction from the physiological organ or biorgan. See morphon.