Resembling, containing, or relating to foals; having the qualities or characteristics of a young horse.
From 'foal' + '-y' (adjective suffix), following the common English pattern of adding '-y' to nouns to create descriptive adjectives like 'milky' or 'meaty'.
The '-y' suffix is one of the most productive word-builders in English—you can attach it to almost any noun to create a new adjective, which is why English speakers can spontaneously create words like 'soggy' or 'groggy' and others understand immediately.
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