Last Updated
：2025/12/07
太古代
Hiragana
たいこだい
Proper noun
Japanese Meaning
太古代（たいこだい）は、地質時代区分の一つで、始生代（しせいだい）と同義とされることがある語。主に地球史のごく初期を指し、原始的な地殻形成や初期の生命の誕生が起こったとされる時代。
Easy Japanese Meaning
とてもむかしのちきゅうのじだいのなまえで、いちばんはじめのちかくのじだい
Sense（1）
Synonym of 始生代
（ canonical ）
（ romanization ）
（ hiragana ）
Quizzes for review
See correct answer
The creatures of the ancient times were significantly different from the creatures of today.
The creatures of the ancient times were significantly different from the creatures of today.
See correct answer
太古代の生物は、現在の生物とは大きく異なっていました。
Japanese - English
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