from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A knoblike enlargement at the end of an axon, where it forms a synapse with other neurons.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A bud-like swelling, especially one at the end of an axon
from The Century Dictionary and Cyclopedia
- n. Button.
- n. In entomology, the spoon-like or button-like extremity of the tongue of the honey-bee.
French, button, from Old French; see button.(American Heritage® Dictionary of the English Language, Fourth Edition)