| 甲 | jiǎ | first of the ten heavenly stems 十天干; (used for an unspecified person or thing); first (in a list, as a party to a contract etc); armor plating; shell or carapace; (of the fingers or toes) nail; bladed leather or metal armor (old); ranking system used in the Imperial examinations (old); civil administration unit (old) |
| 甲基 | jiǎ jī | methyl group (chemistry) |
| 甲乙 | jiǎ yǐ | first two of the ten heavenly stems 十天干 |
| 甲醛 | jiǎ quán | formaldehyde (HCHO) |
| 甲烷 | jiǎ wán | methane CH4 |
| 甲板 | jiǎ bǎn | deck (of a boat etc) |
| 甲苯 | jiǎ běn | toluene C6H5CH3; methylbenzene |
| 甲酸 | jiǎ suān | formylic acid (HCOOH); formic acid; methanoic acid |
| 甲骨文 | jiǎ gǔ wén | oracle script; oracle bone inscriptions (an early form of Chinese script) |
| 甲醇 | jiǎ chún | methyl alcohol; methanol CH3OH; wood alcohol; wood spirit |
| 甲午战争 | Jiǎ wǔ Zhàn zhēng | the first Sino-Japanese War of 1894-95 |
| 甲子 | jiǎ zǐ | first of 10 heavenly stems 天干 and first of 12 earthly branches 地支; by ext., the 60 combinations 甲子, 乙丑, 丙寅 etc making up the year cycle; first year A1 of the 60 year cycle, e.g. 1984 or 2044 |
| 甲状腺 | jiǎ zhuàng xiàn | thyroid gland |
| 甲第 | jiǎ dì | residence of a noble; top candidate in the imperial examinations |
| 甲状腺肿 | jiǎ zhuàng xiàn zhǒng | goiter (enlargement of thyroid gland) |
| 甲壳 | jiǎ qiào | carapace; crust; outer shell |
| 甲鱼 | jiǎ yú | turtle; terrapin |
| 甲二醇 | jiǎ èr chún | methylene glycol |
| 甲亢 | jiǎ kàng | hyperthyroidism; abbr. for 甲状腺功能亢进 |
| 甲仙 | Jiǎ xiān | Jiaxian or Chiahsien township in Kaohsiung county 高雄县, southwest Taiwan |
| 甲仙乡 | Jiǎ xiān xiāng | Jiaxian or Chiahsien township in Kaohsiung county 高雄县, southwest Taiwan |
| 甲午 | jiǎ wǔ | thirty first year A7 of the 60 year cycle, e.g. 1954 or 2014; cf 甲午战争, the first Sino-Japanese War of 1894-95 |
| 甲型 | jiǎ xíng | type A; type I; alpha- |
| 甲型肝炎 | jiǎ xíng gān yán | hepatitis A |
| 甲基安非他命 | jiǎ jī ān fēi tā mìng | methamphetamine |
| 甲基苯丙胺 | jiǎ jī běn bǐng àn | methamphetamine |
| 甲寅 | jiǎ yín | fifty first year A3 of the 60 year cycle, e.g. 1974 or 2034 |
| 甲形球蛋白 | jiǎ xíng qiú dàn bái | alpha globulin; alpha fetoprotein (AFP) |
| 甲戌 | jiǎ xū | eleventh year A11 of the 60 year cycle, e.g. 1994 or 2054 |
| 甲方 | jiǎ fāng | first party (law); see also 乙方 |
| 甲替色氨酸 | jiǎ tì sè ān suān | abrin |
| 甲壳动物 | jiǎ qiào dòng wù | crustacean |
| 甲壳素 | jiǎ qiào sù | chitin |
| 甲壳虫 | jiǎ qiào chóng | beetle; order Coleoptera; the Beatles (1960s UK pop group) |
| 甲壳虫类 | jiǎ ké chóng lèi | coleoptera |
| 甲壳类 | jiǎ qiào lèi | crustacean |
| 甲氧西林 | jiǎ yǎng xī lín | methicillin (a semi-synthetic penicillin) |
| 甲氨基 | jiǎ ān jī | methyalamino group |
| 甲流 | jiǎ liú | type A influenza; abbr. for 甲形H1N1流感; refers to H1N1 influenza of 2009 |
| 甲状 | jiǎ zhuàng | thyroid (gland) |
| 甲状腺功能亢进 | jiǎ zhuàng xiàn gōng néng kàng jìn | hyperthyroidism; abbr. to 甲亢 |
| 甲状腺素 | jiǎ zhuàng xiàn sù | thyroid hormone; thyroxine (used to treat underactive thyroid) |
| 甲申 | jiǎ shēn | twenty first year A9 of the 60 year cycle, e.g. 2004 or 2064 |
| 甲申政变 | Jiǎ shēn zhèng biàn | unsuccessful and bloody Korean palace coup in 1884 by westernisers against conservatives, crushed by Qing troops |
| 甲硝唑 | jiǎ xiāo zuò | metronidazole (antibacterial agent); Flagyl (US) |
| 甲硫氨酸 | jiǎ liú ān suān | methionine (Met), an essential amino acid |
| 甲磺磷定 | jiǎ huáng lín dìng | pralidoxime mesylate |
| 甲等 | jiǎ děng | grade A; first-class |
| 甲级 | jiǎ jí | first rate; top class; excellent |
| 甲级战犯 | jiǎ jí zhàn fàn | a grade A war criminal |
