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regulant

[ reg-yuh-luhnt ]
/ ˈrɛg yə lənt /
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noun

a substance, as a chemical, used to control or regulate: herbicides and fungicides as regulants for plant growth.

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The rainy weather could not ________ my elated spirits on my graduation day.

Origin of regulant

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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