| 衍 | yǎn | to spread out; to develop; to overflow; to amplify |
| 敷衍 | fū yǎn | to elaborate (on a theme); to expound (the classics); perfunctory; to skimp; to botch; to do sth half-heartedly or just for show; barely enough to get by |
| 衍射 | yǎn shè | diffraction |
| 衍生物 | yǎn shēng wù | a derivative (complex product derived from simpler source material) |
| 信贷衍生产品 | xìn dài yǎn shēng chǎn pǐn | credit derivative (in finance) |
| 夏衍 | Xià Yǎn | Xia Yan (1900-1995), Chinese writer, playwright, socialist critic and movie pioneer |
| 推衍 | tuī yǎn | to deduce; to infer; an implication; same as 推演 |
| 敷衍了事 | fū yǎn liǎo shì | to skimp; to work half-heartedly; not to bother |
| 敷衍塞责 | fū yǎn sè zé | to skimp on the job; to work half-heartedly; not to take the job seriously |
| 沃衍 | wò yǎn | rich and fertile (soil) |
| 箧衍 | qiè yǎn | bamboo box |
| 繁衍 | fán yǎn | to multiply; to reproduce; to increase gradually in number or quantity |
| 罗摩衍那 | Luó mó yǎn nǎ | the Ramayana (Indian epic) |
| 胄裔繁衍 | zhòu yì fán yǎn | descendants are great in numbers (idiom) |
| 蕃衍 | fán yǎn | to multiply; to reproduce; to increase gradually in number or quantity |
| 衍化 | yǎn huà | to evolve (of ideas, designs, constructions etc); to develop and change |
| 衍射格子 | yǎn shè gé zi | diffraction grating (physics) |
| 衍射角 | yǎn shè jiǎo | angle of diffraction (physics) |
| 衍生 | yǎn shēng | to give rise to; to derive; derivative; derivation |
| 衍生产品 | yǎn shēng chǎn pǐn | derivative product; derivative (in finance) |
| 衍圣公 | Yǎn shèng gōng | hereditary title bestowed on Confucius' descendants |
| 衍圣公府 | Yǎn shèng gōng fǔ | the official residence of Confucius' descendants at Qufu 曲阜, Shandong |
| 衍变 | yǎn biàn | to develop; to evolve |
| 邹衍 | Zōu Yǎn | Zou Yan (305-240 BC), founder of the Yin and Yang School of Thought of the Warring States Period (475-221 BC) |
| 金融衍生工具 | jīn róng yǎn shēng gōng jù | derivatives (finance) |
| 金融衍生产品 | jīn róng yǎn shēng chǎn pǐn | financial derivative |
| 铺衍 | pù yǎn | to spread out widely; to disseminate |
