The rules of Tamil onomatopoeia are laid down in the grammar book Tolkāppiyam from Sangam literature.
There are two types of onomatopoeia described in Tamil namely, இரட்டைக் கிளவி ("irattai k-kilavi") and அடுக்குத் தொடர் ("atukku th-thodar").
Irattai kilavi consists of two words paired with one another which does not give a stand alone meaning when separated (an example is 'துறுதுறு' in 'துறுதுறு என்ற விழிகள்').
In the second book of Tolkāppiyam, the first chapter of Kilāviyakkam describes:[1] இரட்டைக் கிளவி இரட்டின் பிரித்து இகைய irattaik kilavi irattin piritu icaiya doubled word from its doubling does not stand There are three types of doublets described.
[2] Atukku thodar consists of two words stacked after one another which give a different meaning when separated (an example is 'பிடி பிடி பிடி').