Adhesiveness is that properties of sand due to it adheres or cling to the sides of the moulding box.
It is the property of sand due to which the sand grains stick together during ramming.
It is defined as the strength of the moulding sand.

An organic binder is an organic ingredient used to bind together two or more other materials in mixtures. Its two principal properties are adhesion and cohesion. Organic Binder Materials, Physical State Binder Types: water, oil, and sodium silicate.

It is used for making cores and sometimes called oil sand.
This is silica sand mixed with core oil composed of linseed oil, resin, light mineral oil and other binding materials.

A pure silica sand employed on the faces of the pattern before moulding is known as parting sand.
When the pattern is withdrawn from the mould, the moulding sand sticks to it.
To avoid sticking, parting sand is sprinkled on the pattern before it is embedded in the moulding sand