Wankel engine
Concise Oxford English Dictionary © 2008 Oxford University Press:
Wankel engine /ˈwaŋk(ə)l, ˈvaŋ-/
▶noun a rotary internal-combustion engine in which a curvilinear, triangular, eccentrically pivoted piston rotates in an elliptical chamber, forming three combustion spaces that vary in volume as it turns.
– origin 1960s: named after the German engineer Felix Wankel.
'Wankel engine' also found in these Oxford entries:
