from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See sycamore.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A tree, the buttonwood.
from the GNU version of the Collaborative International Dictionary of English
- n. See buttonwood.
from The Century Dictionary and Cyclopedia
- n. The plane-tree of the United States, Platanus occidentalis: so called from its small, round, pendulous fruits or nutlets. Also incorrectly called sycamore.
From its button-shaped fruit.(American Heritage® Dictionary of the English Language, Fourth Edition)
button + ball? (Wiktionary)