熱ねっ水すい

ね

っ

す

い

Meanings

General term for water that is hot or boiling. Used in everyday contexts such as cooking, cleaning, or describing hot liquids.

hydrothermal water; hydrothermal solution

Geological term for naturally heated water, often mineral-rich, found in geothermal areas or used in hydrothermal processes.

お湯ゆ
Common everyday word for hot water, especially for bathing or drinking. 熱水 is more technical or formal.
熱ねっ湯とう
Refers specifically to boiling water, often emphasizing high temperature. 熱水 can include hot but not necessarily boiling water.

A compound of 熱 “heat” and 水 “water.” The reading ねっすい reflects regular gemination of final つ before the following サ-row consonant.