The Eryayi 爾雅翼 "Wings to the Erya" is a glossary dictionary from the Southern Song period 南宋 (1127-1279). It was written by Luo Yuan 羅願 as a supplement to the Erya 爾雅, which belongs to the Confucian classics. Although the book was finished in 1174 it took almost a century before it was published. The scholar Wang Yinglin 王應麟 had obtained a printed copy from a descendant of Luo Yuan in 1270.
The Eryayi contains 32 juan "scrolls" that mainly deal with plants and animals. Unlike the Erya classic, the Eryayi quotes from sources and also indicates these.
In 1320 the Yuan period 元 (1279-1368) scholar Hong Yanzu 洪焱祖 wrote a commentary called Eryayi yinshi 爾雅翼音釋, which is the base for all modern editions, like that contained in the collectaneum Xuejin taoyuan 學津討原.
Source: Zhou Zumo 周祖謨 (1988). "Eryayi 爾雅翼", in: Zhongguo da baike quanshu 中國大百科全書, Yuyan wenzi 語言文字, p. 66. Beijing/Shanghai: Zhongguo da baike quanshu chubanshe.