Also found in: Dictionary, Thesaurus, Medical, Financial, Wikipedia.


Due to an external cause; not arising within the organism.
Growing by addition to the outer surfaces.
Pertaining to those factors in the metabolism of nitrogenous substances obtained from food.



in botany, a term referring to the development of lateral organs in the peripheral cell layers of the main axis of a particular plant organ. Examples of exogenous organs are the leaves that develop in the form of external nodes on the growing point of shoots, root hairs (which are lateral growths of root integuments), and some epidermal growths (trichotomes) of a plant’s aboveground organs.

References in periodicals archive ?
There were evidences that exogenous application of proline decreased the accumulation of Na+ under salinity condition and enhanced K+/Na+ ratios (Heuer, 2003; Ahmed et al.
The observed exogenous variables are represented by vector X; they include the BASIC scores for Vehicle Maintenance, Controlled Substance, Driver Fitness, Fatigue Driving, and Unsafe Driving.
However, a significant difference in exogenous oxidation (Fig.
Another important function of the intestinal immune system is to distinguish between enteric symbiotic bacteria and invading pathogenic microbiota, thus conferring immune tolerance on enteric symbiotic bacteria and immune response to exogenous pathogenic bacteria by decolonizing them.
Compared with control, after the exogenous application of CaCl2, isocitrate dehydrogenase (IDH) activity was increased significantly by 2.
Effect of supplemental exogenous enzymes on performance of finishing Awassi lambs fed olive cake-containing diets.
Rivera, "Radiological and clinical findings in acute and chronic exogenous lipoid pneumonia," Journal of Thoracic Imaging, vol.
Research should be undertaken to elicit the exact nature and clinical impacts of the pharmacological interaction of exogenous cannabinoids in bone marrow transplant patients.
The nonlinear mapping functions f(*) and g(*) are used to represent the complex relationship that exists between the current value of the wind speed or wind power and previous values of these quantities and the exogenous inputs.
Use of exogenous phytase can be a tool to decrease the phosphorous excretion.