caffeine
カフェイン
解説 Definition
caffeine はカフェインという意味です。コーヒーやお茶、エナジードリンクなどに含まれる成分を指し、日本語の「カフェイン」とほぼ同じ意味で使われます。
Caffeine is a natural stimulant found especially in coffee, tea, and some soft or energy drinks. It can make a person feel more awake and is often discussed in terms of how much a drink contains or when someone avoids consuming it.
覚え方のコツ Memory Tip
coffee や café と同じ「コーヒー」の語幹に、物質名でよく見られる -ine が付いた語と捉えます。a lot of caffeine、avoid caffeine、caffeine-free のように、飲料に含まれる量や摂取を控える場面と結び付けると、成分としての「カフェイン」を覚えやすくなります。
Connect caffeine with coffee and café: all three visibly point toward the drink most strongly associated with this stimulant. The ending -ine commonly appears in names of chemical substances, so the word can be remembered as “the coffee-associated substance.” Learn it through practical combinations such as contain caffeine, a lot of caffeine, avoid caffeine, and caffeine-free. This keeps the focus on caffeine as an ingredient whose amount or consumption people discuss, rather than merely treating it as a Japanese loanword.
例文
This coffee has a lot of caffeine.
このコーヒーにはカフェインが多く含まれています。
I avoid caffeine after dinner.
私は夕食後はカフェインを避けています。
Some tea contains less caffeine than coffee.
お茶の中にはコーヒーよりカフェインが少ないものもあります。
caffeine の類義語・関連語
caffeine の語源・成り立ち Etymology
英語 caffeine はドイツ語 Kaffein やフランス語 caféine を経て広まり、もとは coffee に化学名の接尾辞 -ine が付いた語です。つまり『コーヒー由来の成分』がそのまま名になった形で、caffeinated や decaffeinate も同じ語幹です。
English caffeine came through French caféine and German Kaffein. These forms were built from words meaning “coffee,” ultimately associated with French café and German Kaffee, plus the chemical-name suffix -ine. The name therefore reflects the substance’s close association with coffee, although caffeine also occurs naturally in tea and other plants. Caffeinated, decaffeinated, and decaffeinate are later formations based on the same word.
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