pre-emergent

preemergent

[pree-i-mur-juhnt]
adjective Horticulture.
1.
of or pertaining to seedlings before they emerge or appear above ground: a preemergent weed-killer.
noun
2.
a preemergence chemical, as a herbicide.
Also, pre-emergent.


Origin:
1955–60; pre- + emergent

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