Writing Balance Rule: The top rain radical (雨) must be wide and flat, while the bottom field component (田) sits snugly underneath, balanced evenly on the central vertical axis.
1. Meaning
thunder
surname Leimilitary mine, such as land mineslang: to shock, stun, or astoundTaiwan slang: spoiler, or to reveal plot details
Airflow Tactile Test: Air flows freely around both sides of tongue.
Tongue & Mouth Position: Tongue tip touches the alveolar ridge right behind the upper front teeth.
Final Rhyme
ei
Vowel Group: -e vowel group
Sounds like: -ei rhymes with 'ay' in 'say'
Mouth Shape Guide: Pronounce as standalone vowel 'ay'.
Common Learner Trap: Keep vowel quality steady across all 4 tone contours.
Tone
T2 (35)
3 → 5 (35)
2nd Tone (Mid-Rising)
Tone Pitch & Cadence: Tone 2 rises from mid to high pitch, exactly like asking 'Huh?' or 'What?' in English when you need clarification.
Sandhi: When followed by another Tone 3 syllable, léi changes to a rising tone, but standard dictionary reading is Tone 2.
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Listening trap: Confusing Tone 2 (léi) with Tone 4 (lèi), where Tone 4 drops sharply while Tone 2 rises.
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Physical Tone Gesture: A rising hand gesture moving upward like an ascending staircase, matching a questioning 'What?' in English.
3. Writing
Topology: Top-bottom · Strokes: 13 strokes
Writing Balance Rule: The top rain radical (雨) must be wide and flat, while the bottom field component (田) sits snugly underneath, balanced evenly on the central vertical axis.
4. Components
Radical雨 · Rain radical (rain, weather phenomena)
Semantic Clue (形旁):雨 (indicates weather and atmospheric phenomena)
Phonetic Clue (声旁):田 (original sound: tián / léi phonetic connection via ancient sound shifts)
Dark rain clouds gather above (雨), and deep inside the wet fields (田), vibrations rumble like thunder.
雨 Rain / weather classifier on top
田 Farmland / fields at the bottom
Phonetic Family (形声字家族)
4· Phonetic Root: 雷 (léi)
5. History
Liushu category: Phono-semantic (形声)
Origin: Originally depicted rolling clouds and falling drops of rain (雨) combined with a stylized depiction of underground rumbling or fields (田) where lightning strikes.
Semantic Evolution: From ancient times meaning weather thunder, it extended to military mines (objects buried in the ground that explode like thunder) and modern internet slang for shocking surprises or spoilers.
In ancient Chinese mythology, the God of Thunder (雷公) was believed to punish wrongdoers with thunder and lightning.
6. Sinosphere
🇻🇳
Sino-Vietnamese
lôi
Mandarin rising tone 2 corresponds roughly to Vietnamese ngã or hỏi depending on historical register, but here yields lôi.
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Kanji (Japanese)
On: ライ (rai) / Kun: かみなり (kaminari)
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Hanja (Korean)
뢰
Sound Shift Bridge: Shared East Asian cultural vocabulary cognate with Sino-Japanese 'rai' and Sino-Vietnamese 'lôi'.
7. Memory
Vivid Mnemonic Story
Heavy rain (雨) pours over the farmer's field (田), and suddenly a massive clap of THUNDER (léi) shakes the earth!
Phonetic Family (形声字家族)
雷
léithunderRain on top, fields below.
霩
kuòvast sky opening upUses rain radical with broader structural components.
Lookalikes & Traps (形近字)
电(diàn)
电 means lightning/electricity, whereas 雷 has rain and fields for thunder.
雪(xuě)
雪 means snow, sharing the top rain radical but with sweeping hand/broom strokes at the bottom instead of a square field (田).
8. Mastery
Active Recall Challenge
昨天晚上打很大，把我惊醒了。
Clue: léi
Common Learner Pitfall
Confusing the bottom component (田 - field) with similar boxed radicals like 日 or 口 when handwriting.
Memory Prompts
Recognition: When you see '雷', what weather event or secondary military/slang meanings come to mind?
Production: How do you write the character for 'thunder' (léi) combining rain and fields?
Real-World Video Context
Watch authentic native speakers pronounce and explain this word in real-world YouTube videos.
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雷léithunder
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