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A knoblike enlargement at the end of an axon, where it forms a synapse with other neurons.

[French, button, from Old French; see button.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


the enlarged part of a nerve fibre or cell which facilitates contact between nerves
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
Upon her head boards, in large gilt letters, he read Bouton de Rose, --Rose-button, or Rose-bud; and this was the romantic name of this aromatic ship.
Bouton part of the inscription, yet the word rose, and the bulbous figure-head put together, sufficiently explained the whole to him.
Then the house had been boldly planned with a ball-room, so that, instead of squeezing through a narrow passage to get to it (as at the Chiverses') one marched solemnly down a vista of enfiladed drawing- rooms (the sea-green, the crimson and the bouton d'or), seeing from afar the many-candled lustres reflected in the polished parquetry, and beyond that the depths of a conservatory where camellias and tree-ferns arched their costly foliage over seats of black and gold bamboo.
Le systeme MMI sur la console centrale fait le choix de la simplicite et ne comporte que six boutons. La version haut de gamme, le systeme MMI navigation plus avec MMI touch, integre sur le haut du bouton poussoir rotatif un pave tactile qui reconnait les ecritures manuscrites et permet de zoomer, par exemple.
In a step towards classification, we present evidence for differences in the density of two types of boutons, terminaux and en passant, in feed-forward projections from S1.
La disposition de l'ecran tactile central, parfaitement accessible par le conducteur, permet de minimiser le nombre de boutons physiques.
A cause de tous ces elements, l'acne doit etre prise en charge des l'apparition des premiers boutons, il est important de se tourner vers un specialiste en dermatologie capable de bien diagnostiquer l'acne et d'apporter une reponse personnalisee.
Il s'appelle le "bouton d'Alep" et il ravage les visages de nombreux habitants du nord syrien.
A noter, AaAaAeA@galement, que la du Sud entend repousser AaAaAeA une date ultAaAaAeA@rieure -- au-delAaAaAeA des Jeux Olym -- les manoeuvres militaires amAaAaAeA@ricano-sud-corAaAaAeA@ennes Foal Eagl Kev Resolve qui, chaque annAaAaAeA@e, exaspAaAaAeA@raient tellement Kim Jong-un q leur approche ce dernier, qui avait coutume de multiplier ses tirs de missiles, a dAaAaAeA@clarAaAaAeA@, cette fois-ci, AaAaAeA l'adresse de son hom amAaAaAeA@ricain : [beaucoup moins que]Le bouton nuclAaAaAeA@aire est toujours mon bureau.