| 618 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 715 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 689 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1027 | A New Dictionary of Kanji Usage |
| 4789 | Classic Nelson (Andrew Nelson) |
| 819 | Essential Kanji (P.G. O’Neill) |
| 1838 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 516 | Kanji and Kana (Spahn and Hadamitzky) |
| 525 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1420 | Kanji in Context (Nishiguchi and Kono) |
| 1797 | Kodansha Compact Kanji Guide |
| 1968 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1049 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1415 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1449 | Les Kanjis dans la tete (Yves Maniette) |
| 39871 | Morohashi |
| 1563 | New Japanese English Character Dictionary (Jack Halpern) |
| 6177 | New Nelson (John Haig) |
| 1437 | Remembering The Kanji (James Heisig) |
| 1545 | Remembering The Kanji, 6th edition (James Heisig) |
| 791 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in grade 5
JLPT level N1
1218 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 酸 【サン】 acid, sourness, sour taste
- 酸化 【サンカ】 oxidation, oxidization
- 炭酸 【タンサン】 carbonic acid, carbonated water, carbonated drink, baking soda, sodium carbonate
- アミノ酸 【アミノサン】 amino acid
Kun reading compounds
- 酸い 【すい】 sour, acid
- 酸葉 【すいば】 sorrel (Rumex acetosa), Common sorrel, garden sorrel, spinach dock
Readings
- Korean:
- san
Spanish
- ácido
- agrio
Portuguese
- ácido
- amargo
- azedo
- picante
French
- acide
- aigre
- amer
- sur (goût)
| 3267 | 2001 Kanji |
| 7e7.2 | The Kanji Dictionary |
| 1-7-7 | SKIP code |
| 1364.7 | Four corner code |
| 1-27-32 | JIS X 0208-1997 kuten code |
| 9178 | Unicode hex code |
Jōyō kanji, taught in grade 4
JLPT level N3
678 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 類 【ルイ】 kind, sort, type, class, genus, order, family, similar example, parallel, the like
- 類似 【ルイジ】 resemblance, similarity, likeness, analogy
- 魚類 【ギョルイ】 fish, fishes
- 魚介類 【ギョカイルイ】 marine products, seafood, fish and shellfish
Kun reading compounds
- 類い 【たぐい】 kind, sort, type, equal, match, peer
- 類いする 【たぐいする】 to be equal to, to be as good as, to be a match for, to rival
Readings
- Korean:
- ryu
Spanish
- variedad
- clase
- parecido
- afectar
Portuguese
- espécie
- tipo
- variedade
- classe
- gênero
French
- sorte
- variété
- classe
- genre
| 534 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 632 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 602 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 680 | A New Dictionary of Kanji Usage |
| 5138 | Classic Nelson (Andrew Nelson) |
| 493 | Essential Kanji (P.G. O’Neill) |
| 1012 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 2755 | Japanese Names (P.G. O’Neill) |
| 3.16 | Japanese for Busy People |
| 226 | Kanji and Kana (Spahn and Hadamitzky) |
| 226 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 563 | Kanji in Context (Nishiguchi and Kono) |
| 1896 | Kodansha Compact Kanji Guide |
| 2275 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1176 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1606 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 940 | Les Kanjis dans la tete (Yves Maniette) |
| 43608P | Morohashi |
| 1807 | New Japanese English Character Dictionary (Jack Halpern) |
| 6647 | New Nelson (John Haig) |
| 931 | Remembering The Kanji (James Heisig) |
| 1000 | Remembering The Kanji, 6th edition (James Heisig) |
| 480 | The Kanji Way to Japanese Language Power (Dale Crowley) |
| 636 | Tuttle Kanji Cards (Alexander Kask) |
| 1061 | 2001 Kanji |
| 9a9.1 | The Kanji Dictionary |
| 1-9-9 | SKIP code |
| 9148.6 | Four corner code |
| 1-46-64 | JIS X 0208-1997 kuten code |
| 985e | Unicode hex code |