meter measure
"Meter" is a Greek root. It comes from the Greek word "metron," which means measure.
Assuming you mean cred- as in incredible, credibility, etc., it comes from the Latin word credere (to believe).
meter means measurment
uni (latin) mono (greek) both of them mean one
No, it's from Greek meter "mother" and polis"city."
Yes. tetranocular mean four eyes in Greek and Latin
Yes. Heptanocular mean seven eyes in Greek and Latin
Yes. Equinomorph does mean horse-shaped in Greek and Latin.
Yes. Psychovore does mean mind-consumer in Greek and Latin.
Yes. Hexabrachial mean six arms in Greek and Latin
Yes. Hematovore does mean blood-consumer in Greek and Latin.