Hai Collection, Lower Volume
Radical: Deer (lù)
Character: Yu
Kangxi Strokes: 18
Page 1510, Entry 04
According to the Extensive Rhymes (Guangyun) and the Collected Rhymes (Jiyun), the pronunciation is yu (rising tone).
According to the Extensive Rhymes (Guangyun), it refers to a male deer.
According to the Literary Expositor (Erya), in the section explaining beasts: for roe deer, the male is called yu.
Also, yu-yu describes the appearance of a group gathering.
According to the Book of Odes (Shijing), in the section Lesser Odes (Xiao Ya): the does and stags are gathered in a group.
Also, according to the Extensive Rhymes (Guangyun), the pronunciation is wu.
According to the Collected Rhymes (Jiyun) and the Rhyme Assemblage (Yunhui), the pronunciation is yu (level tone).
Also, according to the Collected Rhymes (Jiyun), the pronunciation is yu (rising tone).
The meaning is the same.