What does 粒子 mean?
粒子 is a Japanese noun meaning “particle; grain” in English. It is written as 粒子 in kanji, りゅうし in hiragana, and ryuushi in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
空気中のごく小さい粒子がガンのもとになり得る。
Tiny particles in the air can cause cancer.