noun Date: 1822 an engine in which the to-and-fro motion of one or more pistons is transformed into the rotary motion of a crankshaft
RECIPROCATING ENGINE
Meaning of RECIPROCATING ENGINE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012