(ˈ)bü|tōⁿ noun
or bouton ter·mi·nal -ˌterməˈnal
( plural boutons -ōⁿ ; or boutons termi·naux -ˈnō)
Etymology: French bouton terminal, literally, terminal button
: a terminal club-shaped enlargement of a nerve fiber lying in contact with the body or dendrites of another neuron — called also end bulb, end foot