How to say "chlorine" in Japanese

• 塩素えんそCommon
  nounThe common word for the element chlorine (Cl). Use it whenever you name the substance itself, in chemistry or in everyday talk about disinfecting tap water and pools.
• クロール
  nounA katakana loanword for the same element, less common than 塩素. It turns up in everyday contexts such as swimming pools and water treatment; for the element in general, 塩素 is the default.
• 塩素系えんそけい
  prenominal modifierLess common than 塩素, and not a name for the element itself: it means 'chlorinated' or 'chlorine-based', describing things that contain or use chlorine, as on household cleaning-product labels.

Use 塩素 for the element chlorine itself; 「クロール」 is a less common loanword for the same element, heard around pools and water treatment; 塩素系 means 'chlorinated', describing chlorine-based things rather than naming the element.

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

• 塩素えんそchlorine (Cl)
• クロールchlorine (Cl)
• 塩素系えんそけいchlorinated