Definitions for "Tailfin"
one of a pair of decorations projecting above the rear fenders of an automobile
The tailfin era of automobile styling encompassed the 1950s and 1960s, peaking between 1958 and 1960. It was a style developed in the United States but spread its influence worldwide, as cars designed in all parts of the world picked up styling trends from the American automobile industry. General Motors design chief Harley Earl is generally credited for the automobile tailfin, introducing small fins on the 1948 Cadillac.
a stabilizer that is part of the vertical tail structure of an airplane