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preemergence

or pre-e·mer·gence

[pree-i-mur-juh ns]
adjective
  1. occurring or applied before the emergence of a plant from the soil: preemergence herbicide.
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Origin of preemergence

First recorded in 1930–35; pre- + emergence
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018