grimalkin (n.)youdaoicibaDictYouDict[grimalkin 词源字典]
name given to a cat, 1620s, as in, or from, Shakespeare's Gray-Malkin, in "Macbeth" (1605), hence any cat, especially an old she-cat; from gray (adj.) + Malkin, diminutive of fem. proper name Matilda or Maud.[grimalkin etymology, grimalkin origin, 英语词源]