Webster’s Revised Unabridged Dictionary · 1913
Idorgan
Id·or′gan (ĭd·ôr′gan), n. [Gr. εἶδος form + E. organ.] (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.