| 1661 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1756 | A New Dictionary of Kanji Usage |
| 2546 | Classic Nelson (Andrew Nelson) |
| 1468 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 821 | Japanese Names (P.G. O’Neill) |
| 1301 | Kanji and Kana (Spahn and Hadamitzky) |
| 1380 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1844 | Kanji in Context (Nishiguchi and Kono) |
| 1191 | Kodansha Compact Kanji Guide |
| 455 | Kodansha Kanji Dictionary (Jack Halpern) |
| 280 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 340 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 183 | Les Kanjis dans la tete (Yves Maniette) |
| 17386 | Morohashi |
| 380 | New Japanese English Character Dictionary (Jack Halpern) |
| 3125 | New Nelson (John Haig) |
| 181 | Remembering The Kanji (James Heisig) |
| 193 | Remembering The Kanji, 6th edition (James Heisig) |
| 1276 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in junior high
JLPT level N1
1618 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 洞 【ドウ】 sinus, cavity, antrum, neighborhood (administrative division in North Korea)
- 洞察 【ドウサツ】 discernment, insight
- 空洞 【クウドウ】 cavity, hollow, cave, cavern, hollow
- 風洞 【フウドウ】 wind tunnel
Kun reading compounds
- 洞 【ほら】 hollow, cavity, hole, cave
- 洞穴 【ほらあな】 cave, cavern, den, grotto
Readings
- Japanese names:
- とう
- Korean:
- dong, tong
Spanish
- cavidad
- hueco
- excavación
- prever
Portuguese
- gruta
- caverna
- escavação
French
- antre
- grotte
- excavation
| 349 | 2001 Kanji |
| 3a6.25 | The Kanji Dictionary |
| 1-3-6 | SKIP code |
| 3712.0 | Four corner code |
| 1-38-22 | JIS X 0208-1997 kuten code |
| 6d1e | Unicode hex code |
毛
Jōyō kanji, taught in grade 2
JLPT level N2
1179 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 毛 【モウ】 one-thousandth, 0.03 mm (one-thousandth of a sun), 0.01 percent (one-thousandth of a wari), 3.75 milligrams (one-thousandth of a monme), old monetary unit (0.0001 yen)
- 毛皮 【ケガワ】 fur, skin, pelt, kanji "fur" radical
- 不毛 【フモウ】 barren, sterile, infertile, unproductive (e.g. discussion), fruitless
- 再生毛 【サイセイモウ】 recycled wool, reclaimed wool
Kun reading compounds
- 毛 【け】 hair, fur, wool, down, plumage, feathers
- 毛皮 【けがわ】 fur, skin, pelt, kanji "fur" radical
- お毛毛 【おけけ】 pubic hair
- 猫っ毛 【ねこっけ】 fine, soft hair
Readings
- Japanese names:
- めん、 も
- Korean:
- mo
Spanish
- pelaje
- vello
- pluma
- cultivo
- producción
Portuguese
- peles
- cabelo
- pena
- abaixo
French
- pilosité
- pelage
- cheveux
- plumage
- duvet
| 142 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 230 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 210 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 521 | A New Dictionary of Kanji Usage |
| 2473 | Classic Nelson (Andrew Nelson) |
| 125 | Essential Kanji (P.G. O’Neill) |
| 661 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 117 | Japanese Names (P.G. O’Neill) |
| 287 | Kanji and Kana (Spahn and Hadamitzky) |
| 287 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 490 | Kanji in Context (Nishiguchi and Kono) |
| 1147 | Kodansha Compact Kanji Guide |
| 4264 | Kodansha Kanji Dictionary (Jack Halpern) |
| 2152 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2904 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1932 | Les Kanjis dans la tete (Yves Maniette) |
| 16772 | Morohashi |
| 3453 | New Japanese English Character Dictionary (Jack Halpern) |
| 3013 | New Nelson (John Haig) |
| 1913 | Remembering The Kanji (James Heisig) |
| 2062 | Remembering The Kanji, 6th edition (James Heisig) |
| 103 | Tuttle Kanji Cards (Alexander Kask) |
| 2256 | 2001 Kanji |
| 0a4.33 | The Kanji Dictionary |
| 4-4-3 | SKIP code |
| 4-4-4 | SKIP code |
| 2-1-3 | SKIP code |
| 2071.4 | Four corner code |
| 1-44-51 | JIS X 0208-1997 kuten code |
| 6bdb | Unicode hex code |