noun. The process of rooting branches, twigs, or stems that are still attached to a parent plant, as by placing a specially treated part in moist soil.

noun. The operation of propagating plants by layers. See layer, v. t.

noun. A propagating by layers.

noun. A method of plant propagation by rooting cuttings.

verb. Present participle of layer.

"Fourth, the committee concluded that in a few significant instances the analysis in the NIE suffered what we call a layering effect."

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layer