Honeycombing or internal checking, refers to the separation of the fibres in the interior of the wood, usually along the wood rays. The failures are often not visible on the surface, although they can be the extension of surface or end checks.
Checks in the interior of a piece of wood, usually caused by casehardening during rapid drying.
Checks, often not visible at the surface, that occur in the interior of a piece of wood usually along the wood rays.