1. a portion of mest which has been organized and is being controlled by theta. Organisms are alive. They are the physical manifestation of life. Theta is said, then, to be the "energy" of life. (It is not to be confused with physical energy, which is the "e" of "mest.") (Abil 114A)2. an organism is composed of theta and mest and their altered form, entheta and enmest. (SOS, Bk. 2, p. 246)