"seed of beans," 1680s, of uncertain origin; found earlier in podware "seed of legumes, seed grain" (mid-15c.), which had a parallel form codware "husked or seeded plants" (late 14c.), related to cod "husk of seeded plants," which was in Old English. In reference to pregnancy from 1890; in reference to a round belly from 1825. Meaning "detachable body of an aircraft" is from 1950. Pod people (1956) is from movie "Invasion of the Body Snatchers," based on novel by Jack Finney.