Rendaku (้ฃๆฟ): Why ๆ + ็ด Becomes ใฆใใฟ, Not ใฆใใฟ
You know ็ด is ใใฟ (paper). So why is ๆ็ด (letter) read ใฆใใฟ? This voicing of the second word in a compound is called rendaku (้ฃๆฟ). Itโs everywhere, it follows patterns, and it even has a rule for when it stays silent.
What Rendaku Is
When two words join into a compound, the first sound of the second word often becomes voiced: ใโใ, ใโใ, ใโใ , ใฏโใฐ, etc. So ใใฟ becomes ใใฟ, ใฒ becomes ใณ, ใใ becomes ใใ.
It is not random โ it signals โthese two words are now one.โ Recognizing it helps you read compounds correctly and understand why a familiar word suddenly sounds different.
Common Examples
When It Doesn't Happen (Lyman's Law)
The most useful exception: rendaku is blocked if the second word already contains a voiced consonant (ใ, ใ, ใ , ใฐโฆ). This is known as Lyman's Law.
So ้ขจ (ใใ) already has a voiced ใ โ and ๆฅ้ขจ stays ใฏใใใ, not ใฏใใใ. One voiced sound per element is the limit.
How to Handle It
- Expect it, don't force it. Rendaku is a strong tendency, not an absolute rule โ learn each compound as you meet it.
- Use Lyman's Law as a quick check: if the second word already has ใ/ใ/ใ /ใฐ, it probably won't voice.
- It connects to spelling: rendaku of ใค/ใก gives ใฅ/ใข (see the yotsugana article).
Teacher's Note
Don't try to predict rendaku perfectly โ even native speakers can't for new or rare compounds. Learn the common ones by ear, keep Lyman's Law in your back pocket, and you'll read the vast majority correctly.
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