notchback

[noch-bak]
noun
  1. a style of back for an automobile in which there is a sharp vertical drop-off from the roof line to the trunk.
  2. an automobile having such a back.
Compare fastback.

Origin of notchback

1960–65; notch + back1, on the model of hatchback, fastback, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018