noun
: an oscillating lever that pivots on a central axis and serves for transmitting power in such a way as to produce a reciprocating or reversible motion — called also working beam
noun
: an oscillating lever that pivots on a central axis and serves for transmitting power in such a way as to produce a reciprocating or reversible motion — called also working beam
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012