Last Updated
：2025/11/22
mass extinction
Noun
countable
uncountable
Japanese Meaning
大量絶滅：短期間に地球上の生物種の約75％が失われるような、急激かつ大規模な生物多様性の喪失現象。 / 地質学および進化論の観点から、比較的短い地質時代（約300万年以内）において、一度の大規模な滅亡事象により多数の種が絶滅する現象を指す。
（ plural ）
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(evolutionary theory, geology) A sharp decrease in the total number of species in a relatively short period of time; specifically, a loss of ∼75% of all species on the planet over a geologically interval of less than 3 million years, as a result of a mass extinction event.
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mass extinction
Scientists studying fossil records found evidence that a sudden mass extinction reshaped marine ecosystems.
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Scientists studying fossil records found evidence that a sudden mass extinction reshaped marine ecosystems.
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