Webster’s Revised Unabridged Dictionary · 1913
Arcuation
Arc′u·a′tion (ärk′ū·ā′shŭn), n. [L. arcuatio.] 1. The act of bending or curving; incurvation; the state of being bent; crookedness. Coxe.
2. (Hort.) A mode of propagating trees by bending branches to the ground, and covering the small shoots with earth; layering. Chambers.