淡水|たんすいtansui[0]heiban (flat)

1. no-adjectivefresh water (i.e. not salt water)
   この装置そうちにより、簡単かんたんに海水かいすいを淡水たんすいに変かえることが可能かのうとなった。↗

   This device made it possible to turn sea-water into fresh water easily.

• Synonym真水まみずNeutralWater with no salt; the everyday spoken word, while 「淡水」 sounds more formal and scientific. Also used figuratively for real government fiscal spending.
• Antonym海水かいすいNeutralSeawater; the direct opposite of 「淡水」.

In scientific or formal contexts, including compounds like 「淡水魚」, use 「淡水」; in everyday speech 「真水」 is the common word. For seawater, use 「海水」.

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

1. 塩分えんぶんをほとんど含ふくまない水みず。