fastback

[ fast-bak, fahst- ]
/ ˈfæstˌbæk, ˈfɑst- /

noun

a form of back for an automobile body consisting of a single, unbroken convex curve from the top to the rear bumper.
a car having such a back.
Compare notchback.

Origin of fastback

An Americanism dating back to 1960–65; fast1 + back1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for fastback

fastback

/ (ˈfɑːstˌbæk) /

noun

a car having a back that forms one continuous slope from roof to rear
British a type of pig developed from the landrace or large white and bred for lean meat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012