1) substance that moves throughout an organism after it is absorbed. 2) any condition. disease. disorder. or pest that affects the entire organism.

Merriam-Webster Online Dictionary
systemic (adjective)
of, relating to, or common to a as - system
a) affecting the body generally
b) supplying those parts of the body that receive blood through the aorta rather than through the pulmonary artery
c) of, relating to, or being a pesticide that as used is harmless to the plant or higher animal but when absorbed into its sap or bloodstream makes the entire organism toxic to pests (as an insect or fungus)
systemic (noun)
a systemic pesticide
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systemic (Wikipedia)

Systemic refers to something that is spread throughout, system-wide, affecting a group or system, such as a body, economy, market or society as a whole. Systemic may also refer to:

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