Eryayi 爾雅翼 "Wings to the Erya" is a lexicon from the Southern Song period 南宋 (1127-1279) written by Luo Yuan 羅願 (1136-1184), courtesy name Duanliang 端良, style Cunzhai 存齋, as a supplement to the Erya 爾雅, which belongs to the Confucian Classics. The Eryayi itself is in bibliographies counted to the category of books of "lesser learning" (Xiaoxue 小學), often translated as "lexicography".
The Eryayi contains 32 juan that mainly deal with plants and animals. Unlike the Erya classic, the Eryayi quotes from sources and also indicates these, often in lengthy explanations. The Eryayi might thus better be rated as a dictionary or encyclopaedia rather than a pure glossary. The entry to the first lemma for instance, he 禾 "grain", covers more than three folia.
Although the book was finished in 1174, it took almost a century before it was published. The scholar Wang Yinglin 王應麟 (1223-1296) had obtained a printed copy from a descendant of Luo Yuan in 1270 and organised for its publication. In 1320, during the Yuan period 元 (1279-1368), the scholar Hong Yanzu 洪焱祖 (1267-1329) wrote a commentary called Eryayi yinshi 爾雅翼音釋, which is the base for all modern editions, like that contained in the series Xuejin taoyuan 學津討原.