What is the Greek word for Normal?

There isn't one single perfect Greek word translation for "normal" because the meaning depends on the context. "Normal" can refer to:

* Normal as in usual or typical: κανονικός (kanonikós) is a good choice for this meaning. It implies something conforming to a rule or standard.

* Normal as in average or standard: μέσος (mésos) means average or middle.

* Normal as in healthy or not abnormal: φυσιολογικός (physiologikós) is suitable here, as it refers to something in accordance with the laws of nature or physiology.

* Normal as in perpendicular: κάθετος (káthetos) is the specific word for perpendicular, a geometric "normal."

Therefore, the best Greek translation depends entirely on the context in which you're using the word "normal."