parallax (n.)youdaoicibaDictYouDict[parallax 词源字典]
1570s, from Middle French parallaxe (mid-16c.), from Greek parallaxis "change, alteration, inclination of two lines meeting at an angle," from parallassein "to alter, make things alternate," from para- (see para- (1)) + allassein "to change," from allos "other" (see alias (adv.)). Related: Parallactic.[parallax etymology, parallax origin, 英语词源]