| 1 | 乙 | 乙 | yǐ | yi3 | second of the ten Heavenly Stems 十天干 ); ethyl; bent; winding; radical in Chinese characters (Kangxi radical 5); ancient Chinese compass point: 105° | | |
| 2 | 乙醇 | 乙醇 | yǐ chún | yi3 chun2 | ethanol C2H5OH; same as alcohol 酒精 | | |
| 3 | 乙烯 | 乙烯 | yǐ xī | yi3 xi1 | ethylene; vinyl | | |
| 4 | 乙炔 | 乙炔 | yǐ quē | yi3 que1 | acetylene; ethyne C2H2 | | |
| 5 | 乙酸 | 乙酸 | yǐ suān | yi3 suan1 | acetic acid (CH3COOH); ethanoic acid | | |
| 6 | 乙型 | 乙型 | yǐ xíng | yi3 xing2 | type B; type II; beta- | | |
| 7 | 乙烷 | 乙烷 | yǐ wán | yi3 wan2 | ethane (C2H6) | | |
| 8 | 乙未 | 乙未 | yǐ wèi | yi3 wei4 | thirty-second year B8 of the 60 year cycle, e.g. 1955 or 2015 | | |
| 9 | 乙烯基 | 乙烯基 | yǐ xī jī | yi3 xi1 ji1 | vinyl; vinyl group (chemistry) | | |
| 10 | 乙酰 | 乙酰 | yǐ xiān | yi3 xian1 | acetyl (chemistry) | | |
| 11 | 乙酰胺吡咯烷酮 | 乙酰胺吡咯烷酮 | yǐ xiān àn bǐ luò wán tóng | yi3 xian1 an4 bi3 luo4 wan2 tong2 | piracetam (C6H10N2O2) | | |
| 12 | 乙酰胆碱 | 乙酰膽鹼 | yǐ xiān dǎn jiǎn | yi3 xian1 dan3 jian3 | acetylcholine ACh (amine related to vitamin B complex) | | |
| 13 | 乙酸基 | 乙酸基 | yǐ suān jī | yi3 suan1 ji1 | acetyl radical CH3COO- | | |
| 14 | 乙型肝炎 | 乙型肝炎 | yǐ xíng gān yán | yi3 xing2 gan1 yan2 | hepatitis B | | |
| 15 | 乙型脑炎 | 乙型腦炎 | yǐ xíng nǎo yán | yi3 xing2 nao3 yan2 | epidemic encephalitis B, aka Japanese encephalitis | | |
| 16 | 乙氧基 | 乙氧基 | yǐ yǎng jī | yi3 yang3 ji1 | ethoxy (chemistry) | | |
| 17 | 乙酉 | 乙酉 | yǐ yǒu | yi3 you3 | twenty-second year B10 of the 60 year cycle, e.g. 2005 or 2065 | | |
| 18 | 乙种 | 乙種 | yǐ zhǒng | yi3 zhong3 | beta- or type 2 | | |
| 19 | 乙种促效剂 | 乙種促效劑 | yǐ zhǒng cù xiào jì | yi3 zhong3 cu4 xiao4 ji4 | beta-2 agonist | | |
| 20 | 乙种粒子 | 乙種粒子 | yǐ zhǒng lì zǐ | yi3 zhong3 li4 zi3 | beta particle (electron, esp. high speed electron emitted by radioactive nucleus) | | |
| 21 | 乙种射线 | 乙種射線 | yǐ zhǒng shè xiàn | yi3 zhong3 she4 xian4 | beta ray (electron stream from radioactive decay) | | |
| 22 | 乙状结肠 | 乙狀結腸 | yǐ zhuàng jié cháng | yi3 zhuang4 jie2 chang2 | sigmoid colon (anatomy); bent colon, linking the descending colon to the rectum | | |
| 23 | 乙硫醇 | 乙硫醇 | yǐ liú chún | yi3 liu2 chun2 | ethanethiol (chemistry) | | |
| 24 | 乙氨基 | 乙氨基 | yǐ ān jī | yi3 an1 ji1 | ethylamino group | | |
| 25 | 乙丑 | 乙丑 | yǐ chǒu | yi3 chou3 | second year B2 of the 60 year cycle, e.g. 1985 or 2045 | | |