While the word "tricha" (τριχα) does exist in Greek, it does not mean "a single hair".
* Tricha (τριχα) is the plural form of "thrix" (θριξ), which means "hair" in general, referring to a strand of hair.
The word for "a single hair" in Greek is "thrix" (θριξ).
It's easy to get confused because of the similar sounds, but the meaning of "tricha" is different.