Hai Collection, Middle Volume
Radical: Bird (niǎo)
Yuan
Kangxi strokes: 16
Page 1485, Entry 28
Tang Rhyme (Tangyun), Collected Rhymes (Jiyun), Dictionary of Rhymes (Yunhui): Pronounced yuan (level tone).
Explaining Graphs (Shuowen): A mandarin duck.
Jade Compendium (Yupian): A mated bird. The male is called yuan, and the female is called yang.
Cui Bao, Ancient and Modern Notes (Gujin Zhu): A type of wild duck; the male and female never separate from one another. If a person catches one, the other will surely pine for it and die, hence it is called the mated bird.
Increased Subtlety (Piya): Magpies are fond of the external, while mandarin ducks are fond of internal longing.
Book of Odes (Shijing), Minor Odes (Xiaoya): Mandarin ducks are on the bridge, folding their left wings.
Correction of Graphs (Zhengzitong): The mandarin duck has a red head, black wings and tail, and long white feathers on its head; its body is apricot-yellow and possesses a refined pattern.
Also, Broad Rhyme (Guangyun): Pronounced wen (level tone). Collected Rhymes (Jiyun): Pronounced wen (level tone). The meaning is the same.