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Related to water joint: water on the knee
water joint[′wȯd·ər ‚jȯint]
A joint in a stone pavement containing stones that are set slightly higher to prevent water from settling in the joint.
1. A joint in a stone pavement where the stones are intentionally placed slightly higher than elsewhere; the raised surface is intended to prevent the settling of water in the joints.
2. A saddle joint, 1.