Last Updated
：2025/12/07
白堊紀
Hiragana
はくあき
Kanji
白亜紀
Proper noun
alt-of
alternative
Japanese Meaning
中生代第三期にあたる地質時代。約1億4500万年前から約6600万年前までの期間で、恐竜が繁栄し、被子植物が多様化した時代。 / 地質学・古生物学で用いられる年代区分の一つで、「白亜紀」とも表記される。
Easy Japanese Meaning
むかしのきょうりゅうがいたじだいのなまえで、およそおおむかしのちきゅうのじだいをさすことば
Sense（1）
Alternative spelling of 白亜紀 (“Cretaceous period”)
（ canonical ）
（ romanization ）
（ hiragana ）
Quizzes for review
Alternative spelling of 白亜紀 (“Cretaceous period”)
See correct answer
白堊紀
See correct answer
The Cretaceous period is the era in Earth's history when dinosaurs thrived the most.
The Cretaceous period is the era in Earth's history when dinosaurs thrived the most.
See correct answer
白堊紀は地球の歴史の中で恐竜が最も繁栄した時代です。
Japanese - English
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