1. to interlace or interlock like the fingers of two hands clasped together
Usage: transitive or intransitive; technical/formal
2. (in anatomy or geology) to fit together in an alternating pattern, as structures or layers
Usage: technical; scientific

Examples

• The two pieces of wood interdigitate perfectly, creating a strong joint.
• The fingers interdigitate when you clasp your hands together.
• In geology, the rock layers interdigitate along the fault line.
• The roots of neighboring trees interdigitate beneath the forest floor.
• The muscle fibers interdigitate to provide greater strength and stability.
• The puzzle pieces interdigitate seamlessly at their edges.