Translation guide
The concept of providing or absorbing water, especially for health, skin, or bodily function. Japanese expresses this through nouns, verbs, and set phrases depending on whether you mean drinking enough water, keeping skin moist, or the chemical process.
The act of consuming sufficient fluids to stay healthy, especially during exercise, heat, or illness.
The most common and natural way to say 'hydration' in the sense of replenishing fluids. Used in health, sports, and daily life contexts.
運動中はこまめな水分補給が大切です。
Frequent hydration is important during exercise.
熱中症を防ぐために水分補給を忘れないでください。
Don't forget to hydrate to prevent heatstroke.
A more casual, everyday way to say 'drink fluids' or 'stay hydrated'. Often used in conversation.
もっと水分を取ったほうがいいよ。
You should hydrate more.
A loanword from English, used mainly in sports, fitness, or product marketing. Not as common as 水分補給 in daily life.
このドリンクはハイドレーションに最適です。
This drink is ideal for hydration.
Keeping the skin moist and preventing dryness, often in the context of skincare products.
The standard term for 'moisturizing' or 'hydration' in skincare. Used for creams, lotions, and routines.
この化粧水は保湿力が高いです。
This lotion has high hydrating power.
保湿をしっかりしないと肌が乾燥します。
If you don't hydrate your skin properly, it will get dry.
A descriptive phrase meaning 'to give moisture to the skin'. Used in explanations or advertising.
肌に水分を与える成分が含まれています。
It contains ingredients that hydrate the skin.
The process of combining a substance with water molecules, as in chemistry or geology.
The scientific term for chemical hydration. Used in chemistry, mineralogy, and related fields.
セメントの水和反応について研究しています。
I'm researching the hydration reaction of cement.
Also used in scientific contexts as a loanword, but 水和 is more standard.
ハイドレーションのプロセスを説明します。
I will explain the hydration process.
水分補給 is about drinking water for the body's internal hydration. 保湿 is about keeping moisture in the skin externally. Don't mix them up: you wouldn't use 保湿 for drinking water, and 水分補給 sounds odd for face cream.
水分補給のために水を飲む。
Drink water for hydration.
保湿のためにクリームを塗る。
Apply cream for moisturizing/hydration.
The loanword ハイドレーション is understood but sounds like marketing jargon or technical talk. In everyday conversation about drinking water or skincare, stick to 水分補給 or 保湿.