1620s, "pertaining to harlots," from Latin meretricius "of or pertaining to prostitutes," from meretrix (genitive meretricis) "prostitute," literally "woman who earns money," from merere, mereri "to earn, gain" (from PIE root *(s)mer- (2) "to get a share of something"). Meaning "gaudily alluring, alluring by false attractions" is from 1630s. Related: Meretriciously; meretriciousness.