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polar stratospheric cloud

[ poh-ler strat-uh-sfer-ik kloud, ‐sfeer‐ ]
/ ˈpoʊ lər ˌstræt əˈsfɛr ɪk ˈklaʊd, ‐ˈsfɪər‐ /
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noun Meteorology.

an iridescent cloud in the winter polar stratosphere, as high as 15.5 miles (25 kilometers) above the earth: in both the Antarctic and the Arctic, these clouds contribute to ozone depletion by converting benign forms of chlorine into ozone-destroying forms and by eliminating the nitrogen compounds that curb the destructive effects of chlorine. Abbreviation: PSC

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“Evoke” and “invoke” both derive from the same Latin root “vocāre.”

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Also called moth·er-of-pearl cloud, [muhth-er-uhv-purl-kloud] /ˈmʌð ər əvˈpɜrl ˈklaʊd/ na·cre·ous cloud [ney-kree-uhs kloud] /ˈneɪ kri əs ˈklaʊd/ .

Origin of polar stratospheric cloud

First recorded in 1980–85

Words nearby polar stratospheric cloud

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

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