Resembling a button or having the quality or appearance of buttons; decorated with buttons or button-like projections.
From button + -y (English suffix forming adjectives). Button itself comes from Old French bote, related to 'to push' or 'to thrust forward,' describing something that protrudes.
The -y suffix is one of English's most productive adjective-makers—add it to almost any noun and you get an instant adjective: sticky, fuzzy, roomy, buttony—it's how English keeps inventing new descriptive words.
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