Noun: buttonball
- Very large spreading plane tree of eastern and central North America to Mexico
"The buttonball's mottled bark stood out against the winter sky";
- American sycamore, American plane, buttonwood [N. Amer], Platanus occidentalis
Derived forms: buttonballs
Type of: plane, plane tree, platan, sycamore [N. Amer]
Part of: genus Platanus, Platanus