What is the root word for gnosis?

Could you please enlighten me on the etymological origins of the word "gnosis"? Specifically, I'm curious to know what the root word from which "gnosis" is derived is. It seems to carry a deep philosophical or spiritual connotation, and I'm fascinated by the linguistic roots that give it such meaning. Is there a specific ancient Greek or Latin word that forms the basis of "gnosis", and if so, what does it signify in its original context?