1. Produced or originating from outside; formed or developed externally rather than internally.
Usage: technical; biology

1. An organism or substance that originates from outside a system or body.
Usage: technical; biology

Examples

• The ectogene factors in the ecosystem include climate and soil composition.
• Ectogene influences on plant growth come from the surrounding environment.
• Scientists studied how ectogene pathogens affected the host organism.
• The disease was traced to an ectogene source outside the laboratory.
• Ectogene development occurs when external conditions shape an organism's structure.