Entry 1 sense Webster, 1913 mammothrept /(măm"mō̇*thrĕpt)/ · mam·mo·thrept · IPA /ˈmaməθɹɛpt/ 01 n. A child brought up by its grandmother; a spoiled child. 1. A child brought up by its grandmother; a spoiled child.[R.] “O, you are a more mammothrept in judgment.” — B. Jonson.