Yes. Apeirochromatic does mean infinite colors in Greek.
Polydipsia
Yes, the word polycephaly does mean many heads in the Greek language.
Versicolor (genitive versicoloris), which in addition to "of various colors" could also mean "of changing color."The "coat of many colors" that Jacob gives to Joseph in Genesis 37 is, in the Latin Vulgate Bible, described as polymita, a borrowed Greek word meaning "many-threaded." The implication is that the threads are of diverse colors.
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Yes, polypedal does mean multi-legged in the Greek language.
The term 'Polystomatous' means many mouths in Greek.
Polycardial means many hearts in the Greek language.
Yes. Polymorph means many forms in Greek.
The Greek prefix that means "many" is "poly-".
The word polyhepatic means many livers in Greek language.
The term 'polyoctic' means many ears in the Greek language.