diminutive (adj.)youdaoicibaDictYouDict[diminutive 词源字典]
in grammar, late 14c. (also as a noun, "derivative word denoting a small or inferior example of what is meant by the word it is derived from"), from Old French diminutif (14c.), from Latin diminutivus, earlier deminutivus, from past participle stem of deminuere (see diminish).[diminutive etymology, diminutive origin, 英语词源]