poppet

English Thesaurus

1. a mushroom-shaped valve that rises perpendicularly from its seat; commonly used in internal-combustion engines (noun.artifact)

hypernym	:	valve,
definition	:	control consisting of a mechanical device for controlling the flow of a fluid (noun.artifact)

part meronym	:	ice, internal-combustion engine,
definition	:	a heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine (noun.artifact)