A young pig, especially one that grunts; a piglet.
From Middle English and Old English, derived from grunt with the diminutive suffix -ling, which is used to denote young or small creatures (like duckling, gosling).
The -ling suffix is one of English's most ancient and poetic ways to make things cute—we use it for duckling and gosling, but gruntling never caught on, probably because we just say piglet instead.
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