Source: 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]