What does 化石 mean?
化石 is a Japanese noun meaning “fossil” in English. It can also be translated as “petrifaction” depending on context. It is written as 化石 in kanji, かせき in hiragana, and kaseki in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
私が手にしてるのは貝の化石です。
What I have in my hand is a fossil seashell.