What is referred to by 'axis'?

Based on the clue 'axel foley was a cop on this midwestern citys payr...', what is the answer? What is referred to by 'axel foley'? What is referred to by 'axiom rodeo'? Based on the clue 'axiom i in newtons opticks is angles of this refr...', what is the answer? Based on the clue 'axl had the vocals but slash wailed the riff on th...', what is the answer? Based on the clue 'ay caramba spell check changed the last name of a...', what is the answer? Based on the clue 'ay chihuahua billy west was not only stimpy but th...', what is the answer? Based on the clue 'ay chihuahua its carlos alazraqui who gave this re...', what is the answer?