the excessive domination of a child by his or her mother
momism in American English
(ˈmɑmˌɪzəm)
US
noun
excessive, esp. sentimentalized, devotion to mothers or motherhood, thought to result in a mother's domination over her children and their failure to mature psychologically
Word origin
coined (1942) by P. Wylie, U.S. writer < mom & -ism