| yǐ | second of 10 heavenly stems 十天干/second in order/letter "B" or roman "II" in list "A, B, C", or "I, II, III" etc/second party (in legal contract, usually written 乙方, as opposed to first party 甲方)/ethyl/bent/winding |
| 乙 | second of 10 heavenly stems 十天干 second in order letter "B" or roman "II" in list "A, B, C", or "I, II, III" etc |
| 乙丑 | second year B2 of the 60 year cycle, e.g. 1985 or 2045 |
| 乙二胺 | quadrol; ethylenediamine; ethylene diamine |
| 乙二醇 | glycol ethylene glycol C2H4(OH)2 (antifreeze) |
| 乙亥 | twelfth year B12 of the 60 year cycle, e.g. 1995 or 2055 |
| 乙卯 | fifty second year B4 of the 60 year cycle, e.g. 1975 or 2035 |
| 乙型 | type B type II beta- |
| 乙型肝炎 | hepatitis B |
| 乙型脑炎 | meningitis B epidemic encephalitis B Japanese encephalitis |
| 乙型超声波 | b-mode ultrasound |
| 乙基 | ethyl group (chemistry) |
| 乙基化汽油 | (Am.) leaded gas; (Br.) leaded petrol |
| 乙基汽油 | ethyl gasoline; ethylated gesoline |
| 乙基纤维素 | ethyl cellulose; ethylcellulose |
| 乙夜 | second watch |
| 乙太 | ether |
| 乙太网路 | Ethernet |
| 乙巳 | forty second year B6 of the 60 year cycle, e.g. 1965 or 2025 |
| 乙拌磷 | disulfoton; thiodemeton |
| 乙方 | second party (law) see also 甲方 |