Vowels include a rhyme head, a rhyme belly and a rhyme ending, excluding tones. Rhyme refers to the classification of rhyming words, including rhyme abdomen and rhyme ending. It is the basis of rhyming books. No matter which dynasty or generation, rhyming books have rhyming parts, which belong to words according to rhyme. The concept of rhyme comes from poetry, which has existed since the beginning of poetry, but there is no concept of rhyme in ancient times.
Therefore, Gu said that anyone who has no rhyme in Han, Wei and above books knows that this word must have started from Jin and Song Dynasties. In other words, there were rhyming facts and phenomena in ancient times, but people did not analyze and summarize this phenomenon, so there is no term to refer to this phenomenon.
Introduction of rhyme book
The rhyme in the rhyme book is the rhyme. Homonym base is the basic requirement of rhyme. Different genres of rhyme have different requirements for rhyme, some only require the same rhyme base, while others require not only the same rhyme base, but also the same tone. So different rhymes have different concepts. For example, Qieyun is a rhyming book with different tones, and its rhyme is that the rhyme base and tone of a word are the same.
There is no tone in Zhongyuan Yinyun, and its rhyme is only words with the same rhyme base. So it depends on the situation to distinguish the concept of rhyme in ancient books. Rhyme is a relatively late concept. Before the emergence of ancient phonology in Qing Dynasty, rhyming books and rhymes were only called rhymes, not rhymes. Before the Qing Dynasty, both rhyme and rhyme could be called rhyme.
Reference to the above content: Baidu Encyclopedia-Yunbu