tetrapylonEtymologyBorrowed from Ancient Greek τετράπυλον (tetrápulon, literally “four gates”). Observable as tetra- + pylon.tetrapylon means A Roman-style cubic structure with a gate on each of its four sides. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounA Roman-style cubic structure with a gate on each of its four sides.