intracellular

from WordNet (r) 3.0 (2006)

intracellular
    adj 1: located or occurring within a cell or cells;
           "intracellular fluid" [ant: {extracellular}]

from The Collaborative International Dictionary of English v.0.48

Intracellular \In`tra*cel"lu*lar\, a. (Biol.)
   Within a cell; as, the intracellular movements seen in the
   pigment cells, the salivary cells, and in the protoplasm of
   some vegetable cells; intracellular enzymes. Contrasted with
   {extracellular}.
   [1913 Webster +PJC]