Having the qualities, shape, or texture of a gourd; round and somewhat swollen in appearance.
From gourd plus the Old English diminutive or descriptive suffix '-y', which turns nouns into adjectives. This informal adjective describes things resembling gourds.
The '-y' suffix is one of English's most productive word-makers—you can add it to almost any noun (lumpy, bumpy, gourdy) to describe something that has those qualities, and speakers instantly understand.
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