粒子|りゅうしryuushi[1]atamadaka (head-high)

1. nounparticle; grain
   空気くうき中ちゅうのごく小ちいさい粒子りゅうしがガンのもとになり得うる。↗

   Tiny particles in the air can cause cancer.

• Synonym粒つぶNeutralSmall round things such as grains of rice or drops of water; also a counter. 「粒子」 leans toward physics particles rather than everyday grains.
• Synonym微塵みじんWrittenWritten register: fine dust or motes; with a negation, 「微塵も…ない」, it means not the slightest. 「粒子」 is a fine particle making up matter.
• Synonym微粒びりゅうWrittenWritten register: extremely fine granules, as in 「微粒子」. 「粒子」 is the physics term for the particles that make up matter.
• RelatedかけらNeutralFragments or broken-off pieces; figuratively a shred or trace, often in 「かけらもない」. 「粒子」 is a minute particle, not a fragment.

Use 「粒子」 for particles in physics that make up matter, as in 「素粒子」. For grains of rice or water drops use 「粒」; for extremely fine granules 「微粒」; for broken pieces 「欠片」; and for not the slightest, 「微塵も」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 物質ぶっしつを構成こうせいする細こまかい粒つぶ。