ameliorantn.

Brit.

/əˈmiːlɪərənt/, U.S.

/əˈmiljərənt/,

/əˈmiliərənt/

Origin: Formed within English, by derivation. Etymons: ameliorate v., -ant suffix¹.

Etymology: < amelior- (in ameliorate v.) + -ant suffix¹. Compare later meliorant n.

A substance or thing that improves or alleviates something; spec. a substance added to soil to improve its texture, drainage, or fertility (cf. earlier ameliorator n. 2, and amendment n. 1c).

ΚΠ

1847 Emancipator (Boston) 18 Aug. Roots and haulm, both of which when carefully ‘turned down’ with a smooth and perfect furrow, operate as an invigorating manure to the succeeding crop, and also as ameliorants of the soil.

1946 A. Nelson Princ. Agric. Bot. xxv. 482 Soil ameliorants such as lime, by improving the texture of the soil, altering the hydrogen ion concentration, may aid the plant and/or depress a soil-borne fungus.

1988 N.Y. Times (Nexis) 18 Dec. vii. 22/1 Time for palliatives, ameliorants, placebos. I rise from my chair, feeling numb and wooden, and choose a record album from the shelf. Wolfgang Mozart, Gustav Mahler or Willie Nelson?

2017 D. C. McKenzie in R. Lal Encycl. Soil Sci. (ed. 3) 114 For improving soil structural stability, the best-known ameliorants are gypsum (calcium sulfate) and, to a lesser extent, finely ground limestone (calcium carbonate).

This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2021).

单词	ameliorant
释义	ameliorantn. Brit. /əˈmiːlɪərənt/, U.S. /əˈmiljərənt/, /əˈmiliərənt/ Origin: Formed within English, by derivation. Etymons: ameliorate v., -ant suffix¹. Etymology: < amelior- (in ameliorate v.) + -ant suffix¹. Compare later meliorant n. A substance or thing that improves or alleviates something; spec. a substance added to soil to improve its texture, drainage, or fertility (cf. earlier ameliorator n. 2, and amendment n. 1c). ΚΠ 1847 Emancipator (Boston) 18 Aug. Roots and haulm, both of which when carefully ‘turned down’ with a smooth and perfect furrow, operate as an invigorating manure to the succeeding crop, and also as ameliorants of the soil. 1946 A. Nelson Princ. Agric. Bot. xxv. 482 Soil ameliorants such as lime, by improving the texture of the soil, altering the hydrogen ion concentration, may aid the plant and/or depress a soil-borne fungus. 1988 N.Y. Times (Nexis) 18 Dec. vii. 22/1 Time for palliatives, ameliorants, placebos. I rise from my chair, feeling numb and wooden, and choose a record album from the shelf. Wolfgang Mozart, Gustav Mahler or Willie Nelson? 2017 D. C. McKenzie in R. Lal Encycl. Soil Sci. (ed. 3) 114 For improving soil structural stability, the best-known ameliorants are gypsum (calcium sulfate) and, to a lesser extent, finely ground limestone (calcium carbonate). This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2021). < n.1847
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