Definition of "grimalkin" [gri•mal•kin]

• A cat, especially an old female cat. (noun)
• An old woman considered to be ill-tempered. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A grimalkin, that is to say, a Cat, went out one night to a certain garden, in search of what she might devour, but found nothing and became weak for the excess of cold and rain that prevailed that night."
• "A related word is grimalkin, referring to an old female cat or an ill-tempered old woman."
• "To let the peculiar grimalkin-grimace come on her face, the most weird grimalkin-twang come into her voice?"