The thing which the Greek root "meter" most likely means is:
What is a Root Word?
This refers to the base word which is responsible for the formation of new words through the addition or removal of words through either prefixes, suffixes, etc.
With this in mind, we can see that from the Greek root word "meter", it most likely means measure because it is used to form new words thermometer and diameter which are all forms of measurement.
Read more about root words here:
https://brainly.com/question/7412835
