water
lie detector
Poly = many. e.g. polygamy (many spouses) polygon (many sides). I think graph means lines or drawing (or something close). So it is a machine of many lines.
Poly means many.
The polygraph test is not "proof-positive". The polygraph test is not completely unreliable.
More than one, many or much
The palindrome word for "DETECTOR" is "ROTCEDET."
Clara had to take a polygraph test on the latest game show 'Tell the truth'.
detector or metal detectors
A polyhedron is a solid object all of whose faces are polygons.
It means angle or corner. (poly gon - many angled)
Poly means "many" in English. "πολύ" (polee) is the greek word for "much". "πολλοί". "πολλές", "πολλά" are the equivalents for "many" in greek.
many. poly means many. the word is polygonal