ethephon

[eth-uh-fon]
noun Chemistry.
a solid compound, C 2 H 6 ClO 3 P, used as a growth regulator to accelerate the ripening of tomatoes, citrus fruit, apples, and other crops.

Origin:
1970–75; as shortening of the chemical name 2-chloroethanephosphonic acid; see chloro-, ethane, phospho-, -onic

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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It appears the hydrocarbon yields can be increased using ethephon and morphactin growth hormones.
Samples of walnuts were collected from the harvester at the first and second harvest with and without ethephon treatment.
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