grimalkin

[ gri-mal-kin, -mawl- ]
/ grɪˈmæl kɪn, -ˈmɔl- /

noun

a cat.
an old female cat.
an ill-tempered old woman.

Origin of grimalkin

1595–1605; apparently alteration of gray1 + malkin, diminutive of Maud proper name; see -kin
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British Dictionary definitions for grimalkin

grimalkin
/ (ɡrɪˈmælkɪn, -ˈmɔːl-) /

noun

an old cat, esp an old female cat
a crotchety or shrewish old woman

Word Origin for grimalkin

C17: from grey + malkin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012