Outside the cells.
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ex·tra·cel·lu·lar .ek-strə-'sel-yə-lər adj situated or occurring outside a cell or the cells of the body <\extracellular digestion> <\extracellular enzymes>
ex·tra·cel·lu·lar·ly adv
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adj.
situated or occurring outside cells; for example, extracellular fluid is the fluid surrounding cells.
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ex·tra·cel·lu·lar (eks″trə-selґu-lər) outside a cell or cells.Medical dictionary. 2011.