superphosphate
noun
su·per·phos·phate
ˌsü-pər-ˈfäs-ˌfāt 
1
: an acid phosphate
2
: a soluble mixture of phosphates used as fertilizer and made from insoluble mineral phosphates by treatment with sulfuric acid
Examples of superphosphate in a Sentence
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Coprolites were sorted, washed, and transported by buggy, train, and canal barge to processing facilities, where they were milled and treated with acid to make superphosphate—the world’s first chemical fertilizer.
—
Julia Rosen, The Atlantic, 8 Feb. 2021
Mix a little bone meal or superphosphate in the soil around each tuber.
—Kathy Huber, Houston Chronicle, 2 Feb. 2018
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Julia Rosen, The Atlantic, 8 Feb. 2021
Mix a little bone meal or superphosphate in the soil around each tuber.
—Kathy Huber, Houston Chronicle, 2 Feb. 2018
Cite this Entry
“Superphosphate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/superphosphate. Accessed 31 Oct. 2025.
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superphosphate
noun
su·per·phos·phate
ˌsü-pər-ˈfäs-ˌfāt
: a soluble mixture of phosphates used as fertilizer
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