| 硬脂酸钙 | yìng zhī suān gài | calcium stearate |
| 碘酸 | diǎn suān | iodic acid |
| 碳酸岩 | tàn suān yán | carbonate rock (geology) |
| 磷酰基磷酸酶 | lín xiān jī lín suān méi | phosphorylphosphatase |
| 磷酸盐岩 | lín suān yán yán | phosphorite; phosphate rock |
| 神经氨酸酶 | shén jīng ān suān méi | neuraminidase (the N of virus such as bird flu H5N1) |
| 穷酸相 | qióng suān xiàng | wretched look; shabby looks |
| 精氨酸 | jīng ān suān | argnine (Arg), an essential amino acid |
| 组氨酸 | zǔ ān suān | histidine (His), an essential amino acid |
| 丝氨酸 | sī ān suān | serine (Ser), an amino acid |
| 缩多氨酸 | suō duō ān suān | polypeptide, a chain of amino acids linked by peptide bonds CO-NH, a component of protein; same as 多肽 |
| 缩氨酸 | suō ān suān | peptide (two or more amino acids linked by peptide bonds CO-NH); same as 肽 |
| 缬氨酸 | xié ān suān | valine (Val), an essential amino acid |
| 羟基丁酸 | qiǎng jī dīng suān | gamma-Hydroxybutyric acid, GHB |
| 羧基酸 | suō jī suān | carboxylic acid |
| 胺基酸 | àn jī suān | amino acid; also written 氨基酸 |
| 脱氧核糖核酸 | tuō yǎng hé táng hé suān | DNA |
| 脱氧核苷酸 | tuō yǎng hé gān suān | deoxyribonucleoside monophosphate; dNMP |
| 脱氧脱糖核酸 | tuō yǎng tuō táng hé suān | deoxyribonucleic acid (DNA) |
| 脯氨酸 | pú ān suān | proline (Pro), an amino acid |
| 腐殖酸 | fǔ zhí suān | humic acid |
| 腺嘌呤核甘三磷酸 | xiàn piào lìng hé gān sān lín suān | Adenosine triphosphate (ATP) |
| 色氨酸 | sè ān suān | tryptophan (Trp), an essential amino acid |
| 色胺酸 | sè àn suān | tryptophan |
| 苯丙氨酸 | běn bǐng ān suān | phenylalanine (Phe), an essential amino acid |
| 菸碱酸 | yān jiǎn suān | niacin (vitamin B3); 3-Pyridinecarboxylic acid C6H5NO2; nicotinic acid |
| 苏氨酸 | sū ān suān | threonine (Thr), an essential amino acid |
| 苏胺酸 | sū àn suān | threonine |
| 蛋氨酸 | dàn ān suān | methionine (Met), an essential amino acid |
| 蚁酸 | yǐ suān | formic acid |
| 装酸哭穷 | zhuāng suān kū qióng | to dress poorly an plead poverty (even though rich) (idiom) |
| 解酸药 | jiě suān yào | to relieve acidity; anti-acid |
| 说葡萄酸 | shuō pú tao suān | sour grapes (set expr. based on Aesop); lit. to say grapes are sour when you can't eat them |
| 透明质酸 | tòu míng zhì suān | hyaluronic acid; hyaluronan |
| 酒酸不售 | jiǔ suān bù shòu | "The wine´s gone bad and it cannot be sold" |
| 酪氨酸代谢病 | lào ān suān dài xiè bìng | yrosinosis |
| 酸乳 | suān rǔ | yogurt |
| 酸乳酪 | suān rǔ lào | yogurt |
| 酸奶 | suān nǎi | yogurt |
| 酸奶节 | Suān nǎi jié | Lhasa Shoton festival or yogurt banquet, from first of July of Tibetan calendar |
| 酸曲 | suān qǔ | love song |
| 酸梅 | suān méi | pickled plum; Japanese umeboshi |
| 酸枣 | suān zǎo | sour date (Ziziphus jujuba var. spinosa) |
| 酸模 | suān mó | sorrel (Rumex acetosa) |
| 酸橙 | suān chéng | lime (fruit) |
| 酸溜溜 | suān liū liū | sour; acid |
| 酸浆 | suān jiāng | Chinese lantern plant; winter cherry; strawberry ground-cherry; Physalis alkekengi |
| 酸甜 | suān tián | sour and sweet |
| 酸甜苦辣 | suān tián kǔ là | sour, sweet, bitter and spicy hot; fig. the joys and sorrows of life |
| 酸豆 | suān dòu | tamarind (Tamarindus indica) tropical tree with bean-like fruit; pickled caper |
