preemergence

or pre-e·mer·gence

[pree-i-mur-juh ns]

adjective

occurring or applied before the emergence of a plant from the soil: preemergence herbicide.

Origin of preemergence

First recorded in 1930–35; pre- + emergence
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019