preemergent

or pre-e·mer·gent

[ pree-i-mur-juhnt ]
/ ˌpri ɪˈmɜr dʒənt /

adjective Horticulture.

of or relating to seedlings before they emerge or appear above ground: a preemergent weed-killer.

noun

a preemergence chemical, as a herbicide.

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“I do believe that the buck stops here, that I cannot rely upon public opinion polls to tell me what is right. I do believe that right makes might and that if I am wrong, 10 angels swearing I was right would make no difference.”

Origin of preemergent

First recorded in 1955–60; pre- + emergent
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020