| 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 |
門
Jōyō kanji, taught in grade 2
JLPT level N2
452 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 門 【モン】 gate, branch of learning based on the teachings of a single master, division, phylum, counter for cannons
- 門下 【モンカ】 one's pupil, one's student, one's follower
- 入門 【ニュウモン】 becoming a pupil (of), becoming a disciple, entering an institution, beginning training, introduction (to), primer, guide, entering through a gate
- 宗門 【シュウモン】 (religious) denomination, sect
Kun reading compounds
- 門 【もん】 gate, branch of learning based on the teachings of a single master, division, phylum, counter for cannons
- 門出 【かどで】 setting off (on a long journey), setting out, departure (e.g. for the front), leaving home, starting a new life, starting life anew
- 帝 【みかど】 emperor (of Japan), mikado, (the gates of an) imperial residence
- 口は災いの門 【くちはわざわいのかど】 words can lead to disaster, the tongue is the root of calamities, the more you open your mouth the more likely you are to put your foot in it
- 戸 【と】 door (esp. Japanese-style), shutter, window shutter, entrance (to a home), narrows
- 門浪 【となみ】 waves in narrow straits
- 鳴門 【なると】 strait with a roaring tidal ebb and flow, whirlpool, maelstrom, kamaboko with a spiral whirlpool-like pattern, cooking technique where ingredients are cut in a spiral pattern, Naruto (city in Tokushima), Naruto Strait, Naruto wakame
- 長門 【ながと】 Nagato (former province located in the west of present-day Yamaguchi Prefecture)
Readings
- Japanese names:
- じょう、 も、 と、 ゆき
- Korean:
- mun
Spanish
- puerta
Portuguese
- portões
French
- portail
- compteur de canons
| 143 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 231 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 211 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 385 | A New Dictionary of Kanji Usage |
| 4940 | Classic Nelson (Andrew Nelson) |
| 105 | Essential Kanji (P.G. O’Neill) |
| 269 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 601 | Japanese Names (P.G. O’Neill) |
| 161 | Kanji and Kana (Spahn and Hadamitzky) |
| 161 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 445 | Kanji in Context (Nishiguchi and Kono) |
| 1838 | Kodansha Compact Kanji Guide |
| 1100 | Kodansha Kanji Dictionary (Jack Halpern) |
| 597 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 789 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1630 | Les Kanjis dans la tete (Yves Maniette) |
| 41208 | Morohashi |
| 888 | New Japanese English Character Dictionary (Jack Halpern) |
| 6381 | New Nelson (John Haig) |
| 1616 | Remembering The Kanji (James Heisig) |
| 1743 | Remembering The Kanji, 6th edition (James Heisig) |
| 376 | The Kanji Way to Japanese Language Power (Dale Crowley) |
| 168 | Tuttle Kanji Cards (Alexander Kask) |
| 3853 | 2001 Kanji |
| 8e0.1 | The Kanji Dictionary |
| 1-4-4 | SKIP code |
| 3-8-0 | SKIP code |
| 7777.7 | Four corner code |
| 7777.0 | Four corner code |
| 1-44-71 | JIS X 0208-1997 kuten code |
| 9580 | Unicode hex code |