viscoid /ˈvɪs.kɔɪd/adjective 4noun 1forms 1 adjective4 •(old-fashioned) Composed of viscoid (a powered amorphous form of cellulose). •(old-fashioned) Derived from viscose (a liquid made from cellulose). •Misconstruction of viscous. •(old-fashioned) Describing a type of motion involving the hydrodynamics of viscous fluids intermixing. noun1 •(old-fashioned) A powdered amorphous form of cellulose. formsviscoids