However, if you are looking for a translation of something that sounds like "thannichai" it could be related to:
* "Thanni" (தண்ணி): This means "water" in Tamil. So, "thannichai" could be referring to something related to water, such as "wateriness" or "moisture".
* "Thanni" (தண்ணி) + "chai" (சை): This combination is not a standard word, but "chai" can mean "sound" or "noise". So, "thannichai" could potentially be used to describe a sound related to water, like the sound of water flowing.
Without more context or specific examples, it is difficult to give a precise English translation.
To help me understand what you are looking for, please provide more information about the context where you encountered "thannichai".