Originally: an organizing mechanism, especially a kind of graded field of force, operating in a developing embryo. Later also: a region of an embryo that will form a specific anatomical structure.
2A hypothetical energy field generated by any entity (living or inanimate, including patterns of events, behaviour, or experience), which facilitates the genesis of similar entities, and shapes their pattern of development.
1920s. From morphogenetic + field, after German morphogene Feld.